Your Cheating Heart

"Your cheatin' heart will make you weep,
You'll cry and cry and try to sleep.
But sleep won't come the whole night through,
Your cheatin' heart will tell on you."

Two-timing, playing away from home, having a bit on the side, going behind your partner's back, adultery, infidelity... There are a lot of names for cheating on your partner, but most of them have the same outcome: a world of hurt.

Most of us recognize this type of plot: Bob is married to Alice. One day, Bob sees Carol at a club and is attracted to her. Perhaps things haven't been going so well with Alice for some time. Maybe they just had a major fight and Bob stormed off. Or maybe his marriage is perfectly healthy, and Bob has no excuse. Whatever the reason, Bob flirts with Carol, which eventually leads to a sexual or romantic relationship and the various things that entails. But here's the thing: Bob doesn't tell Alice about it. He doesn't dump her, he doesn't tell her that he thinks the marriage is on the rocks, he doesn't talk to her about Polyamory or swinging, he doesn't even ask for "more space". He continues to play the part of her husband, and expects her to continue being his wife, hoping that Alice won't notice when he starts coming in late for dinner, or ask him about the mysterious expenditures on their joint account. Sometimes, just to really play Alice for a sucker, their marriage will seemingly improve— he buys Alice gifts, pays attention to her and seems much happier, but all the while he's running off to see Carol. For extra scumbag points, he may be keeping Carol similarly in the dark about Alice. Chances are he'll eventually get caught; if he didn't, the story wouldn't have the same dramatic impact. A lot of angst and tension will ensue.

Way back in the day, when marriage was considered permanent and divorce was a word whispered fearfully by gossiping old ladies, The Affair was a shocker of a storyline, and very often an automatic Moral Event Horizon for the cheating partner. However, it's worth noting that even further back in the day, the gods, goddesses and minor side characters of mythology listed "infidelity" under "Hobbies", didn't particularly care if their new "partner" was willing, and got away with it. Only their mortal lovers got the nasty side of the wronged wife's/husband's temper when the affair was discovered.

Nowadays, affairs are common in any Soap Opera and turn up an awful lot in other types of story as well. We don't really expect a fictional husband and wife to stay faithful to each other for forty or so years. Supposedly, a solid marriage makes a boring story (though some would disagree). Often, a sequence of "get together → one cheats → they break up → they make up → the other one cheats", and so on) will be followed so often and so tiresomely that it becomes a Yoyo Plot Point.

What defines cheating usually depends on the context of the story and the characters involved. Stories aimed at younger audiences, or with a clear emphasis on romantic, monogamous relationships, will probably count kissing and flirting as cheating. Most examples of cheating in shows aimed at adults, however, will involve sex. Occasionally, characters may clash specifically because they have different definitions of cheating: for example, the husband who protests that he was drunk and it was "just a kiss" to his furious wife, or a girlfriend who can't understand why her boyfriend doesn't like her flirting with her male friends.

A few rules usually hold true in fiction: Women who cheat are many times portrayed much more sympathetically than men. If a woman cheats, her paramour just scored a massive victory over her cuckolded husband, who is now permanently dishonored. The (male) big boss of any given workplace is likely to be two-timing his wife. The Protagonist remains sympathetic if they cheat, and becomes an innocent, wronged victim if they are the one being cheated on. Bisexuals are portrayed as incapable of faithfulness or have merely informed sexuality, and men are more prone to having affairs than women. note 

Unfortunately, adultery is Truth in Television, as many broken hearts and broken families will testify. It is also one of the most common reasons that people murder each other.

See also Mistaken for Cheating, The Unfair Sex, The Mistress, Good Adultery, Bad Adultery. This is generally the #7 scenario of Triang Relations. This trope may be immediately prefaced by a Wedding Ring Removal.


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    Anime & Manga 
  • Blue Eyes. The main character Tatsuya, gets into the pants of 7 girls by the end of volume 9 (the last one made recently) and it's implied he might get even MORE. And his main girlfriend is only aware of one of these girls. The other five? She doesn't suspect a thing and neither do they.
  • Greg and later Ian from A Cruel God Reigns. Greg cheats on Sandra by raping her son, Jeremy and Ian when he starts to fall for Jeremy and pays him to have sex, even though he is still with Nadia.
  • The first episode of Death Parade is about a newlywed couple where it turns out the husbands doubts about his wifes fidelity caused their deaths. It's left vague if she did cheat or not, though even if she did it's heavily implied her rant at the end was a lie and her unborn baby was her husbands.
  • In Detective Conan, MANY cases of murder or attempted murder involve either the victim or the killer having affairs:
    • A good example of the trope is the one where Ran's mother Eri appears for the first time: a married man brutally murders his Christmas Cake "girl on the side" because she was pressuring him for marriage, not knowing that she was few more than The Mistress.
    • In a filler case, a very attractive lady architect was not only cheating on her much older lawyer husband with her hot co-worker, but she was planning to humiliate the husband via giving him the messiest, cruelest divorce setting possible... so the husband killed her and tried to use Kogoro as the one validating his alibi. Made even worse when both the cuckolded husband and the cheating boyfriend verbally duck it out during the woman's funeral. But then Conan through Kogoro resolves the murder right there.
    • In another filler case, an eccentric writer hires Kogoro to find out if his very hot wife is cheating on him. He ends up brutally murdered and it turns out she was cheating - as revenge for him pulling a cruel Scarpia Ultimatum on her. But neither she nor her lover were the killers.
    • Subverted in a non-filler case. Everything points out to a bride-to-be cheating on her soon-to-be husband with the handsome adoptive son of the family butler and both conspiring to kill the guy's dad as revenge for him arranging the girl's marriage to the eldest son of the super rich family he worked for, thus forcing them to break up... but it turns out the butler's son was the love of the girl's life, and they had been dating prior to being forcibly separated and, more importantly, the groom was the murderer and had tried to frame his lower-class rival in love.
    • In another non-filler case, a talented painter was having an affair with his smart and very pretty assistant. When he said he wanted to break it off, she calmly told him that she could potentially ruin his career since she painted some of the pictures he sold — and he beat her to death, and later tried to use Kogoro to make everyone believe she had killed herself. Logically, Conan wasn't fooled.
    • Subverted in the backstory of Shuichi "Rye" Akai. He was dating Action Girl Jodie Starling by the time he became The Mole in the Black Organization, and then he became a Honey Trap to get close to Akemi, the sister of a high-ranked B.O scientist. However, Akai fell for Akemi for real, realised that he was technically cheating on Jodie... and as soon as he could, he broke up with Jodie.
    • And in another case, a man named Shirou Arisawa is found dead and the culprit is his wife, a famous judo champion named Yuuko. It turns out Yuuko's reason to kill him is that Yuuko used to be the Unrequited Tragic Maiden of her friend and fellow judoka Hajime Kajimoto - and Shirou got so jealous that he specifically had an affair with Hajime's wife, and went out of his way to let Yuuko know that he was cheating on her with her friend/idol/former Unrequited Love's lady. So Yuuko couldn't resist Shirou's pettiness and murdered him, trying to use a meeting with Ran's mother Eri as her alibi... Too bad Conan and Ran had also tagged along.
  • One example comes in the Fruits Basket manga. A teenaged Akito Sohma sleeps with her cousin Kureno in an attempt to ensure that he won't abandon her, having been released from the Zodiac curse - which made the already VERY unstable Akito fall into despair. When her other cousin Shigure finds out, he sleeps with her mother Ren, partly to get back at Akito (who hates her extremely abusive mother) and partly for the family resemblance between mother and daughter. When Akito finds out, she flies into a jealous rage at Shigure and kicks him out of the Sohma main house, not forgiving him for several years.
  • Makie from Futari Ecchi constantly tries to get Makoto to have an affair with her and admits that she is only interested in men already in steady relationships.
    • Makoto and Yura's neighbor Narumi is a mistress. And apparently every single one of her relationships to date has been an affair.
    • Rika and her long-term boyfriend Yamada repeatedly cheat on each other, have multiple sex-friends and yet still get pissed off if they find out the other cheated on them.
    • During one chapter, Matsuzaki wants to ascertain his dominance and attractiveness again now that he's married and decides to have an affair. He gets drunk and sleeps with a co-worker while thinking that he shouldn't cheat on his wife after all. When his wife finds out, she's annoyed, leaves but eventually forgives him and reveals that she's pregnant.
  • I Can't Understand What My Husband is Saying:
    • Played for Laughs when one of Kaoru's work friends comes over in hopes of sleeping with Hajime (said friend had previously been in a Love Triangle with them). Kaoru thought she was talking about playing a game since she referred to it as NTR.
    • Played straight later on when Tobe-chan tearfully mentions that she's getting a divorce because she caught her husband cheating on her.
  • In Part 4 of Jojos Bizarre Adventure we learn that Joseph Joestar had an affair with a woman in Japan a few years before the events of Part 3. Part 4 follows the adventures of his illegitimate son, Josuke Higashikata.
    • When Joseph later adopts a baby named Shizuka that he and Josuke saved, his wife Suzie Q mistakenly assumes Joseph had cheated on her again and flies into a frenzy, though the situation gets sorted out quickly.
  • Kotoura-san: Both of Haruka's parents, on each other. Haruka reveals their secrets, and they divorce and both abandon her.
  • Cheating, or rather, paranoia about being cheated on, is a source of humour in Kyo Kara Maoh! — Yuri's jealous male fiance, Wolfram, calls him "cheater" so often it's practically a nickname. In fact, Yuri only has to be nice to anyone, of either sex, to set Wolfram on a rampage. Whether Yuri is actually capable of cheating, however, depends on whether the viewer considers their accidental engagement valid or not.
  • Mama Mama is a short manga that at first seems to be about a large family however the Twist Ending is both women are married women and they're next-door neighbors.
  • In Neon Genesis Evangelion, Asuka's backstory features her father cheating on Asuka's mom Kyouko with the doctor that took care of her when she was hospitalized after having half her soul sucked out into EVA-02 and completely losing itas a result. Everyone around the Sohryus knew it, Asuka herself included. It's implied that one of Kyouko's motivation to hang herself was getting back at her cheating husband via a Murder-Suicide including her and the Creepy Doll that she believes to be Asuka.
  • Octave: Yukino's girlfriend told her it's okay if she sleeps with a man one day however she took it as Setsuko telling her it is okay to experiment. Understandably her girlfriend is distraught when she learns Yukino cheated.
  • Oniisama e...:
    • Mariko Shinobu's father Hikawa, who is an erotic novel writer, not only had an affair with a former actress during his marriage with Hisako, but also later left his wife for said former actress. This was the cause of Mariko's dislike and distrust towards men.
    • Discussed and averted with Prof. Misonoo. He turned to drinking when his first wife left him and took their child Takehiko (the aforementioned Oniisama) away with her, and it was during this time that he met Nanako's mom, who was a beautiful waitress in his favorite pub and he fell in love with her. The letter proclaiming Nanako to be kicked out from the Sorority accuses her mom of being a homewrecker, but it turns out that it wasn't the case.
  • Happens several times in Pet Shop of Horrors and its sequel series. Generally, this is enough to get one ripped up or horribly poisoned or killed by something. One noteworthy example was when the sweet-looking wife of a gang boss hired a hot woman for some purpose for her husband. The implication was that the woman was an assassin and would kill a rival mafia leader. By the end, it turned out that the hot woman was actually the human form of a Zhen, a bird who can turn any drink to poison, just by adding a feather. The wife was furious at her husband for constantly cheating on her and actually got the Zhen to kill him.
  • In the Yuri one-shot The Red Love Letter Yuuka falls in love with her husband’s little sister. Though to be fair, Yuuka's husband is a huge Jerkass and a lousy partner.
  • This is actually the norm among French nobility in Rose of Versailles: they marry for convenience (or, in Marie Antoinette's case, to seal an alliance between France and Austria), so it's only natural that, once they have a heir around, they'll get some actual loving (the situation in Austria is a bit different, as husband and wife are expected to stay loyal. This is so normal that the Duchess of Polignac openly states the above and brings herself and her husband as examples, and Louis XVI and Oscar's parents are considered weird because they don't have lovers. It's also a source of drama for Marie Antoinette, as she would love to take Fersen as her lover but finds it wrong due having been raised in Austria (where husband and wife are expected to stay loyal to each other) and she's the Queen of France (thus she's expected to have no lovers until she has given birth to a male heir).
  • Played for Laughs in Sailor Moon, where Minako was parallelly dating two men: the sensitive artist Takano and the Badass Biker Torashima. Subverted when it turns out both dudes knew... and they were Hawk Eye and Tiger Eye, who wanted to take peeks at Minako's Dream Mirror, which was the reason why they both were after her. Hilariously, when Minako finds out about this... she says "How dare you guys lie to me?!" and they reply in unison "YOU HAVE NO RIGHT TO SAY THAT!".
  • School Days: Makoto sleeps with pretty much every female character except for his initial girlfriend. He cheats on said girlfriend with another girl, and cheats on her with two more girls. It comes back to bite him. Fatally.
    • He can either play this straight or subvert this in the visual novel. His relationship status and his fate is dependent on the player's choice.
  • In Skyhigh, the pregnant woman was cheated on by her husband.
  • Soul Eater: Maka's father cheated on her mother, which made her paranoid and convinced that All Men Are Perverts. She frequently beats up on Soul for getting a nosebleed at the sight of Blair, and has a breakdown when he seemingly leaves her for Blair.
    Maka: What excuse do men have for cheating?
    Soul: How should I know? Cool men don't cheat.
  • In Taiyou No Ie, Mao's mother had spent the better part of her marriage cheating with a former boyfriend.
  • In Victorian Romance Emma, William is technically guilty of this as well, despite being sympathetic. Told to give up on his love for Emma, he proposes (under duress, it has to be said) to a more "suitable" Proper Lady, Eleanor. On reuniting with Emma however, he continues their chaste love affair while he is still officially betrothed to Eleanor, until he finally breaks the engagement.

    Comic Books 
  • Gambit who been hitting on Rogue for half-a-dozen issues before his estranged wife Belladonna suddenly turned up. More sympathetic than most
  • Cyclops: First he kisses Jean Grey when she is resurrected although he was married to Maddeline Prior (at the time, it should be noted, Maddie had let him think that she was dead), and then much later he cheats on Jean Grey (now his wife) with Emma Frost in a Mental Affair. In the latter case, Frost was his therapist at the time and took advantage of his crippling vulnerability in a spectacular violation of medical ethics.
  • In Batman: No Man's Land, Nightwing is shown to have resumed a relationship with Batgirl, but leaves a celebration early to share a New Year's kiss with Huntress.
  • In Seconds, in the timeline where Katie and Max are married, Katie is still having flings with Andrew, though she does not realize this until it is pointed out to her that she is, in fact, married.
  • Supergirl: In Supergirl Vol. 1 #9, the titular heroine finds out that her then-boyfriend Dale was cheating on her. When she chews him out before breaking up, he is completely unapologetic about his actions.
  • Depending on the Writer, the Betty and Veronica dilemma in Archie Comics is this, though usually it's written as neither being Archie's steady girlfriend or Archie breaking up with one for the other.
  • Button Man: Harry has an affair with a dentist's wife for about a year. Comes into play later when Harry realizes that the man has been working with the Voices to get revenge on Harry.

    Fan Works 
  • A Crown of Stars: When Asuka's mother Kyoko was mentally ill her husband cheated on her with her doctor in the next room where Asuka could hear them. Several characters bring it up and Asuka declared in chapter 33 she does not inted to forgive him:
    Asuka: Oh yes, my wonderful and supportive father, who ditched Mama before she was even gone, and me before she was two weeks in the ground. He can rot in Hell in the cell next to Shinji's father. They can swap "cheating on your child's mother" tips. He can stay wherever the Hell he is now. He'll get all the care from me that he gave my mother and I.
  • Advice and Trust: As they opened up to each other and talked about their pasts in chapter 1, Asuka told Shinji her father did not mourn her later mother long, hinting he cheated on her with the nurse was supposed to take care of her mentally-ill mother.
  • In Dirty Sympathy Klavier falls in love and later enters a romantic relationship with Apollo while he is still with Daryan.
  • A good portion of the drama in The Dear Sweetie Belle Continuity comes from Shining Armor's affair with Princess Luna and his accompanying angst.
  • Doing It Right This Time: Subverted. Ritsuko accused Gendo of cheating on her with her own mother. Gendo replied he and Naoko broke up a good while before he and Ritsuko started dating, and Naoko was aware of it. Ritsuko was not fully convinced but she gave him the benefit of the doubt.
  • Evangelion 303:
    • After reading her girlfriend's diary, Mandy thought Jessika had cheated on her with Asuka. In truth Asuka did not even know Jessika had a crush on her, but Mandy called her a "fucking home-wrecker" anyways.
    • During his bachelor party Touji got a lap dance from a stripper. Later he felt guilty and he confessed Hikari what he had done. Hikari eventually forgave him, but he very nearly ruined his marriage before it even started.
    • After the above events, Hikari's best friend Asuka informed Shinji that any hypothetical adultery would be punished with electricity to a specific male organ.
  • In Ghosts of Evangelion, Kyoko resented her husband for cheating on her. Ironically it turned out she had an affair with a married man when she was a college student.
  • The One I Love Is: The last straw that drove Asuka to suicide was finding Shinji sleeping beside other girl. Although they had not done anything Asuka did not know that, and she thought that he had betrayed her (and in the first -and discarded- version of that chapter Shinji actually had sex with that girl).
  • The Racket-Rotter Chronicles: Goodwin is cheating on Jenni with her best friend Amy. It ends extremely badly for everyone involved.
  • In What About Witch Queen?, prince Eric of Weselton's wife Margaret cheats on him with The Spymaster Glenn Hunter, and she might cheat on him with smuggler king Felix Drachner. He suspects the latter but has no idea of the former.
  • Many Dramione fics start off with Hermione discovering that Ron is cheating on her (usually with Lavender) in order to get that relationship out of the way. Slightly odd, considering that Hermione and Ron didn't actually date during the books.
  • "Heis'he Ri'nanovai": Morgaiah t'Thavrau discovers that she was the product of an adulterous affair between her mother Iliana and her boss, Merken tr'Vreenak. Morgan surmises the two broke off the affair to hide her parentage from tr'Vreenak's wife, as this could've caused a three-way blood feud.
  • Persona EG has several characters cheat on someone at major points during the story:
    • Cadance has been known to cheat on Shining Armor a lot, even before the events in the story itself began. However, the worst time out of all of them was when Cadence's relationship troubles with Shining Armor came to a head and a drunk Cadance seduces and sleeps with Flash.
    • After Sunset moves into the dorm, Shining Armor eventually sleeps with her during a visit at Sweet Apple Acres where he says she looks just like a high school crush he once had. It turns out he was lying; she really resembled a movie character he lusted for.
    • After getting into an argument with Twilight, Flash takes his anger out by having sex with Trixie after helping her with a magic trick, this happens only one day after Flash yelled at Twilight that "he wasn't Cadance". The LTE version expands on this and has Trixie encourage Flash to make up with Twilight.
  • "The Light in the Dark" Bertha Jorkins' father cheated on Mrs. Jorkins with another woman, resulting in Bertha's birth and Mrs. Jorkins' hatred of her. Eileen Prince is having an affair, but who with remains unknown. Meanwhile, both of Maria Zabini's parents are cheating on each other, but neither of them realize it. This actually serves as something of a Freudian Excuse for Maria and her skewed perception regarding relationships, as she has known since she was a small child and was sworn to secrecy by both of them.

    Films — Live-Action 
  • In Another Time, Another Place Janie initially rejects Luigi's inept advances, but gives in eventually and they start an affair. Her husband doesn't seem to notice the extent of their relationship.
  • While on an assignment Morgan Sullivan in Cypher tries to hit on a woman he met in the hotel he's staying at. After striking up a conversation with her, she calls him off when she notices his wedding ring, which he forgot to take off. Subverted. After discovering his real identity as Sebastian Rooks, it turns out that the women, Rita Foster, is his real lover, and his supposed "wife" was just one of his employees who he hired to play the part.
  • In Deconstructing Harry, this has been the protagonist's M.O. for all his life, to the point he's broken up several marriages; the very start shows him cheating on his wife with her (married) sister. He later dumps both for a young, attractive admirer.
  • Basically the whole premise of The Dilemma.
  • In Eve's Bayou, one of the main plot points is 9 year old Eve catching her father with another married woman. Turns out her father often has affairs with his patients.
  • In Fatal Attraction, the cheating husband is played as a victim when his mistress turns out to be a scary stalker who puts his daughter's pet rabbit in a pressure cooker. In one ending she gets nailed with karmic death when her lover's wife shoots her, while we don't see what the wronged wife does to her cheating husband after the events of the movie. Given that the affair endangered her child (the mistress could very easily have gotten her hands on said child, and as the rabbit deal shows was crazy enough to pose a potential threat), the cross between Mama Bear and Woman Scorned would be the really scary part.
  • Happens all over the place in Forgetting Sarah Marshall. First we have the titular character cheating on her boyfriend Peter with the British Rock Star Aldous Snow (later, it's revealed that they've been sleeping together for a year before she told Peter). At dinner, Aldous starts talking and claims that he has a right to bed any woman he wants, which implies that he may have already done so while being with Sarah. Finally, after Aldous breaks up with Sarah, she tries to get back together with Peter, and they even start having sex, before Peter snaps back and leaves in mid-blowjob. Unfortunately for him, he then tries to explain himself to his new girlfriend Rachel, who promptly breaks up with him. Luckily, they get back together after a while.
  • In Heat, Hanna catches his wife cheating on him as a result of his own obsessive devotion to pursuing Neilnote , at the expense of his marriage; he takes it badly. Unexpectedly the scene has comedic elements. Charlene also cheats on Chris with Alan Marciano, so Hanna and Chris have something in common, though the difference is that it is Neil who discovers Charlene's secret while setting up the drop for the bonds with Van Zant.
  • In High Society, details of Seth Lord's infidelity are used as leverage by Spy Magazine to get exclusive coverage of his daughter's wedding, kicktstarting the film's plot.
  • In the Mood for Love is about two neighbors who realize that their respective spouses are having an affair with one another, and become tentatively attracted to each other as well. And, true to form, there's a boss in the story with a mistress as well as a wife.
  • In the made-for-TV film The Killing Secret, Spoiled Sweet teenager Nicole discovers that her boyfriend Greg has been cheating on her for months with Emily, a working class girl who was reported missing and subsequently discovered dead. Greg had gotten Emily, who was portrayed very sympathetically, pregnant, and when Nicole realizes the truth thanks to her budding Odd Friendship with Emily's mother Tina, Nicole promptly wants nothing to do with him. However, all of Nicole's friends are more sympathetic towards Greg than her and act as if he needs "understanding," especially when he becomes pegged as the number one suspect in Emily's murder (and he is the killer). Even Nicole's own mother automatically assumes Nicole had caused the issue which led to the break-up and treats her very coldly from that point on.
  • In Love Actually, Alan Rickman's character appeared to be emotionally cheating on his wife with his secretary by buying her an expensive necklace while buying his wife a CD. However, the CD was what his wife wanted (proving that he did love his wife) and at the end of the movie, despite his wife finding out about the necklace and him admitting to getting it for his secretary, they're not together but have reconciled. In a different Love Triangle in the film, Keira Knightley's character has just gotten married, and learns of her husband's best friend's feelings for her. To help him "move on from them", they share a kiss.
  • Loverboy is about a college slacker (played by Patrick Dempsey) who, unexpectedly, finds himself in the escort business, sleeping with women (all older than him) whose husbands are ignoring them. Why? So he can pay for college and get back to his girlfriend. He sees nothing wrong with this up until the end, when she confronts him about it and is uncertain she wants to stay with him. Interestingly, she doesn't immediately shut him out and appears to understand that he meant well. Then there are his three primary clients, who are obviously cheating. Their husbands are implied (and one outright admits it) to also be cheaters. At the end, two of the couples get back together, seeming to forgive each other's "mistakes". One, though, decides that she's had quite enough of her husband who treats her "like a geisha" and leaves him to rot in jail.
  • Midnight (1939): Helen is cheating on Georges Flammarion with Picot. In their first scene, Helen wipes away lipstick from his cheeks and lips. But Georges knows this, and so he hires Eve Peabody to gum up the works.
  • Mr. Destiny screws with this, when the main character (not the titular character) ends up in an alternate reality where he and his wife are married to different people.
  • In Red Riding Hood, it was discovered that Suzette's affair with Henry's father was the entire reason why the Wolf began its murderous rampage.
  • Sing Street: Conor's mother is openly having an affair with a man called Tony. She ends up moving in with him.
  • Mary Jane Watson in the Spider-Man Trilogy movies is usually cheating on someone. In the first film she cheats on Harry by kissing Spider-Man in the rain. In the second film she is engaged and cheats with Peter Parker. In the third film, she is indignant that Gwen kisses Peter upside down (though it was nothing more than a act for the audience) because that's "their kiss," even though when she first did it, she was the one cheating. What's more, in the midst of her rough patch with Peter, she goes on an in-house date with Harry (her ex and Peter's BEST FRIEND) which ends with a passionate-yet-immediately-regretted kiss. She was always a party girl and flirt in the comics, but her girl-next-door portrayal in the films makes this very jarring.
  • St. Vincent:
    • Maggie's husband was a philanderer, and it broke apart their marriage.
    • Vincent sleeps with a prostitute despite his wife still being alive, and there seem to be some sparks between them. Played with in that Vincent does still care deeply about Sandy but she has long since forgotten who he is.
  • One of the major plotlines in Swing Shift is Kay's eventual affair with Lucky while her husband is away at war. Naturally it turns out badly, though Kay and her husband do reconcile later.
  • Michael Godwin in Swordspoint makes a habit of sleeping with married people (of both genders).
  • Bumblebee plays the Trope Namer song to remind Sam of the trope in Transformers: Revenge of the Fallen. It's worth noting that Sam is actively resisting the other girl, who's coming on very strong. She's a cyborg sent by Megatron to extract Allspark data from Sam's mind. Sam is also indignant after Mikaela walks in on the girl on top of Sam kissing him (metal can be very heavy to push off) and is angry at him for cheating. Sam is angry that Mikaela thinks him capable of cheating and considers himself the wronged party.
  • This drives half the plot of True Lies. Harry discovers that his wife has been having an affair behind his back, but it's a subversion. The guy she was "cheating" with is a loser who was trying to get Helen to sleep with him, but she never does. Nonetheless Harry uses his spy agency's resources to bust her in the middle of meeting with the man he thinks she was cheating with, and recruits her (without disclosing his own identity) so she can have some excitement in her life.
  • Greer in Ghost Ship has a sweetheart back home. He rationalizes trying to make out with the evil female ghost with the silliest excuse possible: "You can't cheat with a dead person, can you?" This makes his death at the ghost's hands partially karmic.
  • The entire plot of the 1968 Claude Chabrol film The Unfaithful Wife is this trope, as is that of its 2002 American remake Unfaithful.
  • The comedy of Unfaithfully Yours comes from how the main character deals with thinking his wife is cheating on him.
  • In The Wolverine, while Mariko is missing, Noburo Mori's partying with hookers, something that greatly angers Logan. Though it's more because this behavior reveals that he's involved in the plot against his fiancée. Then again, Logan had already slept with Mariko at this point, meaning Mariko had been unfaithful too.
  • The World Is Not Enough: Elektra King and Renard are a couple, but she sleeps with Bond. It seems that Renard accepts this to a certain extent because it's part of their plan to get revenge on M, but he's nevertheless jealous of Bond. Renard gets angry at the mere thought that Bond was a good lover to Elektra, as Renard is impotent due to his brain injury.
  • The House of Yes: A rather disturbing example happens in the climax.
  • The whole plot of John Tucker Must Die revolves around this.
  • In Life of the Party, the main character, Michael, thinks that his wife, Phoebe, is leaving him for another man, so he starts a preemptive affair. During the intervention, one of his friends, a former member of his four-man relay team reveals that he's in love with Phoebe, leading to Michael assaulting him and storming off. In the confrontation afterwards, Michael learns that all of his relay team friends have been the victim or perpetrator of infidelity. He later learns that Stuart, the friend who admitted to being in love with Phoebe, had only ever jogged with her and kissed her once, and that Stuart's wife had left him five months before for another man.
  • In Hellraiser: Inferno, corrupt cop Joseph Thorne regularly cheats around on his wife with hookers. His constant absence is clearly making her miserable, but he self-justifies it by claiming that he's just getting what he needs elsewhere and a divorce would destroy her.
  • In Weekend at Bernie's, the title character's mob boss "friend" Vito has Bernie killed in large part for taking Vito's girlfriend Tina. Then, while hapless Richard and Larry are playing Of Corpse He's Alive (due to believing the hitman was still out to get them, but not as long as Bernie was with them), Tina shows up to yell at Bernie for cheating on her, before, well... having one last fling with him. Without noticing he's dead.
  • The Mexican film Amores Perros has this element in its 3 stories:
    • "Octavio and Susana": Octavio seduces and tries to convince his brother's wife, Susana, of leaving his brother to be with him.
    • "Daniel and Valeria": A married man leaves his wife and his little daughters to live with a super-model he met when he was still with his wife.
    • "El Chivo and Maru": A hitman gets a contract on a man, who is shown to be having an affair with a young and married co-worker.
  • Another Mexican film, La Habitacion Azul, deals with this: A man returns to live in his hometown bringing his wife and little daughter, there he re-encounters his old high school crush (now married to his old high school buddy), and they both give in to their desires, starting the main conflict.
  • In The Other Woman, Emilia and Jack get together because he's cheating on his wife, Dr. Soule. Emilia has a strained relationship with her father because he cheated on her mother. Jack eventually points out the parallels.
  • In Paper Moon, Addie and Imogene conspire to break up Moses and Trixie by getting him to catch her with the hotel manager.
  • In Dark Blue, Assistant Chief Holland had a brief affair with his colleague Beth, which he regretted and told his wife about, who eventually forgave him. The corrupt cops intimidate him by continuing to send photographs of the affair to his wife, who tells him that she's going to leave but will continue to support his bid for Chief of Police.
  • In Match Point, though with several VERY dark twists thrown in.
  • The premise of Conversations With Other Women. We never meet either of the protagonists' partners, and the whole film is centered around their night together.
  • In Lost in Translation, Bill is married, yet sleeps with a lounge singer and has an emotional affair with Charlotte. Interestingly, the emotional affair is portrayed sympathetically, while sleeping with the lounge singer is portrayed as betraying Charlotte!
  • In Hook, Peter's wife Moira is frantically waiting by the window at home for him and their children to return, but it doesn't stop Peter from kissing a life-sized Tinker Bell. However, they don't go further and Tinker accepts that Peter does love Moira.
  • In He's Just Not That Into You, Ben cheats on Janine with Anna. His mistress leaves him for sleeping with his wife, and his wife leaves him for his smoking.
  • In Intersection, with Richard Gere, the whole premise is around the husband choosing between his wife and his mistress. He dies before he can reveal that he chose the mistress.
  • The Girl with the Dragon Tattoo has it at an early point: Blomkvist's affair with his business partner has already ended his marriage, but not hers, and remains ongoing.
  • American Beauty has Lester's wife Carolyn cheating on him. Later, Lester attempts to have sex with his daughter's barely legal friend but stops before they do it.
  • The Horse Whisperer has the titular character falling for a married woman, who in turn falls for him. Her husband later arrives, spots it fairly quickly, and gently asks his wife to choose before leaving again.
  • Heartburn, starring Meryl Streep and Jack Nicholson, is all about this. The long-suffering wife eventually realizes that her husband's philandering will never stop, so she leaves him for good.
  • In Middle Men the main character cheats on his wife with a porn starlet.
  • Beautiful Girls sees most of the guys in the film playing with the line. Tommy and Darian are blatantly cheating on their partners with each other which has repercussions for Tommy in the end. Even Willie has somewhat of an emotional affair with a thirteen-year-old girl!
  • A married woman has an affair with the title character in What's Eating Gilbert Grape
  • Dreamland has this, with the protagonist falling for her best friend's boyfriend and winding up with him in the end, with her best friend's blessing.
  • In Mona Lisa Smile one of the girls' husbands is unfaithful prompting the girl to seek an unheard-of at the time divorce from him, much to the consternation of her parents.
  • Forces Of Nature has this, with Ben Affleck's character having a fling with Sandra Bullock's character on the way to his wedding, while trying to decide if marriage is what he truly wants.
  • Even The Dark Knight has a moment of this: Rachel is in a relationship with Harvey and still kisses Bruce Wayne once, before snubbing him again.
  • The Matrix Reloaded: The Merovingian regularly cheats on his wife Persephone. To get back at him, she gives the heroes the Keymaker, in exchange for a kiss with Neo, which she forces him to perform "as if it were with her (Trinity)", while Neo's One True Love Trinity is Forced to Watch. It's every bit as painful as it sounds.
  • In a case of possible Truth in Television, Schindler's List shows the main character was quite the womanizer, to the point where his wife left him (temporarily) over his inability to remain faithful:
    • "I will stay with you only if you promise, no one will ever mistake anyone but me for Mrs. Oskar Schindler."
  • Eternal Sunshine of the Spotless Mind: The receptionist at the memory-wiping clinic, who is in a relationship with one of the technicians, makes a pass at her married boss. He reciprocates. The wife catches them and reveals that they had an affair before. The receptionist then learns that the memory of their previous affair was wiped out by the very clinic she now works for.
  • In The Descendants, Elizabeth was cheating on her husband with a married man (though Matt did admit their marriage was dead). She appeared to have no remorse for what she was doing to both spouses and her denial and lack of remorse caused problems for her oldest daughter who had caught her. She wanted to divorce Matt and have her lover to leave his wife which he was reluctant to do.
  • The Skeleton Twins - Maggie admits to having cheated on her husband with three men.
  • In Kick-Ass 2, Dave's girlfriend Katie, after being his main love interest in the first film and established as a nice and sweet girl, does a 180 in characterisation, and after mistakenly thinking Dave was sleeping with Mindy, breaks up with him and reveals she had been cheating on him all along.
  • Subverted regarding Xibalba from The Book of Life. Word of God stated that it only looked like he cheated on La Muerte with other goddesses, but he never actually did.
  • Buffalo Soldiers: Pvt. Ray Elwood is shamelessly sleeping around with his dimwitted superior's wife behind his back.
  • The plot of The Room is that Lisa is cheating on her fiancé Johnny with his best friend Mark. She's portrayed in a very unsympathetic light, while Mark, oddly enough, is portrayed much nicer, like he's just being manipulated by her.
  • In Sliding Doors, Gerry is either trying to end his relationship with the other woman, or else is now officially with her, but still pining over Helen, depending on which reality is being focused on.
  • An early example can be found in Dodsworth (1936), where the female lead essentially spends the whole movie cheating on her husband with a bunch of fancy European guys.
  • From Strange Magic Marianne catches her fiancee Roland cheating on her right before her wedding.
  • In The Pretty One, Laurel realizes at the worst possible time that the man who her identical twin, Audrey, was having an affair with is the husband of Audrey's boss.
  • Men, Women & Children being about relationships and secrets in the digital age, gets used by one partner in a marriage dealing with a cooled intimacy. The wife, as it turns out. The husband just pays for an escort.
  • Body of Evidence: Defense attorney Frank Dulaney begins an affair with his female client behind his wife's back.
  • In My Old Lady, this is a major plot point.
  • A.I.: Artificial Intelligence: One of Gigolo Joe's clients was a married woman. This becomes a major problem for him when her husband kills her in a jealous rage and frames Joe for it.
  • In The Two Faces of Dr. Jekyll, Kitty cheats on Jekyll with their best friend, Hyde cheats on Kitty with Maria, and Hyde takes it even further by trying to cheat on himself with his wife.
  • Swing High, Swing Low: Skid cheats on faithful Maggie with sexy Anita Alvarez.
  • Clash by Night: Mae cheats on her husband with his best friend, Earl, to disastrous results.
  • Vet Hard: (Dutch 2005 film): Lars the boxer has cheated on his girlfriend Katja, after which she dumped him (this happened just before the beginning of the film). Through a chain of events too contrived to summarize here, he ends up getting a Cruel and Unusual Death as a Disproportionate Retribution. (This is a black comedy, BTW.)
  • The Woman in Red: Teddy, Charlotte. His friends have their own issues.

  • A man bets his wife that she can't say something that will make him happy and sad at the same time. She tells him that out of him and his friends, he has the biggest penis.

  • In Dragon Bones it is mentioned that Ward's father cheated on his mother with her half-sister. Ward suspects he's the only one who knows about it.
    • Queen Tehedra doesn't get to cheat with whom she likes, her husband, the high king Jakoven, appoints her lover. He, on the other hand, cheats on her with as many young men as he can lure into his bed.
  • The Chairman from Memoirs of a Geisha is already married when he gets together with Sayuri, but in this case a man being married and having a danna relationship with a geisha was not frowned upon and was indeed a sign of status during that period. It wasn't cheating as we think of it.
  • The unnamed father in Chapter 36 of The Pale King has multiple affairs. He gets off on the idea of women needing him.
  • Sisterhood Series by Fern Michaels: A number of villains have engaged in this trope. Senator Webster in Payback. Rosemary Hershey in Sweet Revenge, who is female, and her cheating is in no way presented in a sympathetic light. Roland Sullivan in Lethal Justice. Mitch Riley in Hide And Seek. Baron Bell in Deadly Deals. A couple of them receive a divorce as one of the consequences. Interestingly, the trope gets deconstructed in Payback. It's like this...Senator Webster cheated on his wife Julia Webster with multiple women. She had him write down a list of the women he had affairs with. One of them is married, and Julia points out that her husband would have performed mayhem on the Senator if he had known. The real clincher is that the Senator got infected with AIDS from one of the women, and he ended up giving it to Julia! He didn't know he was infected, but still.... Of course, she did reveal the truth to him that they both have AIDS, and he naturally could not believe that powerful he had been infected by such a thing. It goes to show that recklessly sleeping around is not bliss, and that it is in fact dangerous!
  • It's hard to find an Agatha Christie novel that doesn't contain cheating or pretense thereof.
  • A Brother's Price: Keifer Porter. Combined with Lysistrata Gambit. With possibly many people, but definitely including his sister. There is such a thorough aversion of STD Immunity in this book that cheating - and possibly catching something and spreading it back to the group marriage, potentially letting the entire family fall ill and die - is a major concern.
  • It's par for the course for men to cheat on their wives in A Song of Ice and Fire - that's why there are so many bastards everywhere. The most notable situation is the one surrounding Cersei Lannister. Neither she nor her husband were even remotely faithful in their loveless Arranged Marriage, as she's sleeping with her brother and he's sleeping with everyone. When Jaime is imprisoned, Cersei finds solace with their cousin and some bannermen. Later, a close friend. Jaime is crushed when he finds out, especially since, as he points out, he's one of the only men in Westeros who's remained entirely faithful to the woman he loves (if not to the vow of celibacy he took as a member of the Kingsguard).
  • Ludovico has an uncomfortable moment where he realizes that there are four people in the room including himself... and they've all slept with his wife. On the other hand, when he also sleeps with other people to reach Palimpsest, it doesn't cross his mind that he's just as bad because he's doing it for the purpose of finding her.
  • When It Happens To You is primarily about the main couple's marriage falling apart due to the husbands infidelity.
  • Legacy of the Dragokin: Averted but the perception that it does take place is real.
    • Daniar and Jago have a history and Kalak thinks that history is in the present. Daniar did have a relationship and at one point carried his child but there is nothing between them in the story.
    • Kalak visits Zarracka's cell regularly and she tempts him with conjugal sex but he never accepts.
  • Redeeming Love: Oh boy. Angel’s story effectively hinges on this trope—her father allowed her to be sold into prostitution when she was eight because his wife had cheated on him and Angel wasn’t his child. Later on, Angel (temporarily) leaves her own husband to return to life as a prostitute (almost causing him to break his resolve never to hurt her), and she also sleeps with his brother shortly beforehand, although that was because he blackmailed her into it.
  • Your Cheating Heart: Played with. The Laws of Entropy send his wife’s former sexy classmate to visit the protagonist Malyanov, who is certainly tempted to cheat, but doesn’t give in. Later, the same laws make the classmate lose her bra at his flat to be found by his wife, which nearly causes a divorce and forces Malyanov to reveal the truth about the proceedings.
  • Jane Austen's Mansfield Park: Maria Bertram married Mr Rushworth even though she didn't love him. She hoped for a relationship with Henry Crawford even before her wedding, and when he flirted with her later, she couldn't resist. Their relationship went probably further than Henry anticipated. They are discovered by servants and Mr Rushworth's mother makes the affair public. Mr Rushworth is granted a divorce, and Henry and Maria live together for some time. However, he never intends to marry her, which crushes her and they break up. She's punished by having to live in disgrace and she cannot even hope that she could be a part of good, respectable society ever again.
  • Anna Karenina:
    • Count Oblonsky's cheating on his wife Dolly kicks off the plot. Dolly is devastated because she never even considered it as a possibility and admits her naivety. They manage to reconcile, but Dolly is never truly happy again. Their children feel something is amiss as well.
    • Anna Karenina falls for Alexei Vronsky, and he falls for her. Hard. Anna struggles a bit, but she cannot resist her passion. Anna's husband becomes severely depressed when he learns of Anna's infidelity and finds it very difficult deciding whether he will officially divorce Anna, a socially risky move for him, her, and their son.
    • Most of the aristocrats and royalty, with the exception of a "pathetic" few, have had (numerous) affairs.
  • Madame Bovary: Emma's husband Charles is a kind-hearted, yet naive idiot, and he doesn't even come close to Emma's imagination and intelligence. She has two lovers who are pleased about having such a pretty mistress but don't actually care for her that much as she cares for them. Her husband never learns of it while she's alive even though she's hardly discreet.
  • In Southern Sisters Mysteries, Alan cheats on Lisa offscreen at one point, resulting in Lisa briefly staying with Patricia Anne and Fred, which is how she becomes involved in the book.
  • All over the place in The Chronicles of Magravandias. Pharinet and Valraven carry on an affair while married to the Leckerys, Varencienne sleeps with Merlan later Shan and Khaster, with the implication that one of them fathered her third child, Khaster takes up with Tayven while still married to Pharinet, Tatrini implies that she and Leonid both took lovers... basically a side effect of the arranged marriages.
  • During his marriage to Helen in The Tenant of Wildfell Hall, Arthur Huntingdon commits adultery twice that Helen and the reader are aware of—with Lady Lowborough and his son's governess. However, he makes it clear to Helen that he has fooled around with married women before.
  • Elizabeth Wakefield in Sweet Valley High. Actually pretty much everyone in the world of Sweet Valley although Elizabeth gets away with it the most.
  • Both Victor Henry and his wife Rhoda have affairs in Herman Wouk's The Winds Of War, he with Pamela Tudsbury and she with Palmer Kirby. Pearl Harbor intervenes, but in War And Remembrance the affairs resume, and the Henrys divorce, each subsequently marrying his/her lover. The new couples remain friendly toward each other.
  • Horatio Hornblower's eponymous protagonist, while otherwise a more decent individual than the era would normally allow, is not a faithful husband. First he almost steps out on his Unwanted Spouse Maria with Lady Barbara, whom he genuinely falls in love with; later he does have an affair with Marie Ladon while a fugitive in her father's house in France. These are somewhat sympathetic cases, since both times Hornblower was far removed from his wife and, unlike poor Maria, Barbara and Marie are intellectual equals. Then in Commodore, after he's married Lady Barbara, he has a (heavily implied) one-night stand with a Countess while drunk and somewhat bugged out over the fact that his translator almost murdered the Czar. And in Lord Hornblower, he starts thinking about Marie again even before getting the orders that put him on a mission to France. Neither Maria nor Barbara ever learn this (being way geographically distant when Hornblower does this).
  • The Great Gatsby. Tom is openly cheating on his wife Daisy with another married woman, Myrtle. Then he gets pissed off when his wife begins an affair of her own with Jay Gatsby...
  • Vampire Academy:
    • Rose has done this multiple times, but only properly gets called out on it in Last Sacrifice by Adrian.
    • Mia Rinaldi slept with both Jesse Zeklos and Ralf Sarcozy while still dating Aaron.
    • Daniella Ivashkov is married to Nathan Ivashkov but sleeps with Ambrose.
    • Eric Dragomir had an affair with a Las Vegas dancer while seemingly happily married.
    • Prince Rufus Ivashkov is married. According to Adrian, the Prince maintains two secret mistresses.
  • City of Fallen Angels reveals that all wasn't fine and dandy for the Lightwoods after the Circle broke up. Robert blamed their wrecked lives on Maryse, and it seems they were on the verge of separation/divorce but decided to stay together for the sake of Alec and their unborn daughter. Unfortunately, a few years later, Maryse found out about his having an affair with somebody, and confided in Isabelle about it. Still, they stayed together, even if Robert was spending more and more time away.
  • The Giddy Death of the Gays and the Strange Demise of Straights: Caroline considers her boyfriend's falling in love with his male roommate to be breaking the terms of their relationship.
  • In Midnight's Children, Saleem's mother can't let go of her first husband, and sneaks away to a cafe every so often to meet him. Saleem is so disturbed by this that he exposes a cheating scandal between Homi Catrack and Lila Sabarmati to discourage her. He succeeds, but Homi Catrack is killed by Lila's vengeful husband. He didn't intend that outcome, and is shocked when it occurs.
  • Dragonvarld: When Melisande is rescued by a stranger from a non-evident threat, Bellona incorrectly concludes (with the villain's help) that her lover is eloping. Since the two are, respectively, high priestess and captain of the temple guard, the misunderstanding has major implications. The two fugitives do end up developing a degree of attraction, but their eventual sex is the result of a Love Potion, not choice. Neither of them knows about the potion, however, and both consider themselves to have betrayed their partners.
  • In The Shattered Kingdoms, Kira had a brief affair with her husband's brother, but any immediate repercussions were overtaken by her husband getting exiled to what was supposed to be his death. She then becomes the mistress of the Emperor, but this time, it's not hormones — she knows that her husband actually survived, and wants to be in a position manipulate the Emperor away from any course that might result in this being discovered.
  • The Magicians: Quentin cheats on Alice with Janet after having a long period in which he's clearly attracted to her. Alice finds out, having sex with Penny in retaliation. Their relationship quickly disintegrates over this.
  • The Return Of Conannote  begins a year after Conan the Barbarian married Zenobia, the slave girl who saved his life in The Hour of the Dragon. It is noted in the early chapter that "Those who know Conan best are a little bit surprised to see the King, in middle age, turn monogamous and even uxorious". At the Royal Ball of Aquilonia, courtiers can't help noticing that the King and Queen are obviously in love and can hardly keep their hands off each other. Then, Queen Zenobia is abducted by an evil magician and carried off all the way to China. Conan immediately sets off to save her, going all by himself all the way from Western Europe to East Asia, braving countless dangers and repeatedly risking his life countless times on the way. There could be no doubt of his love and devotion to Zenobia - still, while en route he is not precisely monogamous or uxorious. He spends an intensive night of love-making with Devi Yasmina of Vendhya , an old flame of his, and later accepts the sexual reward offered by a Chinese girl whose life he saved. He also shows a considerable interest in the beautiful Turanian spy Thanara, though she had shown herself a cunning and dangerous enemy. In the very end, when Conan and the freed Zenobia make their long way back, Thanara makes a final attempt on Conan's life, and is killed by an arrow from Zenobia's bow.
  • The Scarlet Letter Uses this trope as the vehicle for the plot. Every object and living person seems to be trying to give Hester Prynne a Guilt Complex. Her lover the reverend Dimmsdale has turned into The Atoner and regularly whips himself on the back for the sin he committed. Hester will not say who she cheated with. She is subjected to a form of Humiliation Conga and required to wear a Scarlet "A" on her chest, branding her an adulteress. The child that results from their tryst also specializes in Troubling Unchildlike Behavior given her constant interest in the minister and the meaning of the letter that Hester wears on her chest. It's taken Up to Eleven when she suggests that the reason her mother wears a scarlet"A" on her chest is the same reason that the minister keeps his hand over his heart in public. It's True! (Dimmsdale sewed an A on the inside of his clothes as part of his private atonement.). The only thing that escapes the child is the letter's meaning, but she has the perfect remedy for that. In the end, the reverend finally confesses, but you know what they say..

    Live-Action TV 
  • In's "Secret & Lies", Zoey discovers that her mother is having an affair via surveillance cameras—and that her father is aware of the affair.
  • This is what kicks off Kularb Neua Mek's plot.
  • Made In Chelsea: 99% of relationship problems in this show are caused by cheating.
  • Gilmore Girls:
    • Rory first cheats on Dean with Jess (only a kiss involved, but they're all high-schoolers at the time and kissing is the hottest action anyone gets, even among couples), then consciously with Dean on his wife, Lindsay (sex involved) and then on Logan with Jess again (only kiss). She is called out on the second one (by her mother), but generally regardless of those actions she's portrayed as the series' "good girl".
    • Logan cheats on Rory with a bridesmaid. He later tries to justify it by claiming he thought they were just casual and not officially together. Rory was devastated and thought he lied, but she forgave him or came to trust him about that.
      • Actually, Logan cheated on Rory with three of his sister's bridemaids.
      Rory: You didn't say a word. You just let me walk into a room full of girls you had sex with. Oh, no wait I'm sorry. You just had sex with two of them, one of them you just fooled around with. Whatever that means. She spared me the exact perimeters of the fooling around. You want to fill me in?
      Logan: Rory....
      Rory: You know what? Never mind. I've got a good imagination, I can figure it out.
      Logan: Ok, look....
      Rory: I can't believe it. You didn't just cheat on me. You REALLY cheated on me.
  • Par for the course in Scrubs:
    • Jordan's promiscuity is legendary before she finally settles down (and her cheating caused the divorce between her and Dr. Cox).
    • Dr. Kelso has been having at least one affair at a time throughout his marriage.
    • J.D. and Turk are both tempted to cheat at various points in the story. At one point J.D. made the questionable decision to tell his girlfriend about how he could have cheated on her with the woman he'd lied to her about what he was doing that night to meet, but hadn't.
    • Elliot cheated with JD while in a Long Distance Relationship with Shawn.
    • During a rough patch in Turk and Carla's marriage, caused in part by Turk talking to an ex who didn't know he was married, Carla and JD kiss while drunk.
  • Most of the cast of any given Soap Opera will have at least one affair to their name — Coronation Street and Eastenders are particularly fond of this as a plot.
  • Pick any crime show or detective drama. About half to two-thirds of the time, the murder had to do with someone having an affair. (The rest of the time, it's usually about money.)
  • Used regularly on the comedy Last of the Summer Wine, principally (but not exclusively) with Howard and Marina. Here, the justification for using marital infidelity as comedy is that the characters are generally unattractive and lack the courage to take their affair to a very intimate level. And the fact that for all the absurd lengths they go to in order to cover it up, the wife knows full well what's going on and is not impressed.
  • Too many to count in Skins. The show has been criticised in some quarters for relying on cheating as the primary generator of conflict.
    • In Series 1 Tony cheated on Michelle with many women and one man.
    • Series 2:
      • Sid cheated on Cassie with Michelle.
      • Michelle on Tony with Sid. Debatable as they split up in series 1.
      • Chris on Jal with Angie.
    • Series 3:
      • Pandora on Thomas with Cook.
      • Freddie on Katie with Effy.
      • Emily on Naomi with JJ. (Dubious, because they weren't entirely sure if they were actually dating or not, but Naomi certainly plays it that way.) Which turns Naomi into a hypocrite, since her and Emily's relationship at that point consisted of Naomi coming up with excuses that made it possible for her to consider herself straight in-between make-out sessions and her freaking out and leaving Emily in the middle of the night after their first time together.
    • Series 4:
      • Thomas on Pandora with Andrea.
      • Naomi on Emily with Sophia.
      • Emily on Naomi with that random at the barbeque.
      • Emily on Naomi with Mandy (although it took a while for Naomi to get it).
    • In Series 5, Nick cheated on Mini with Liv.
  • In Noah's Arc:
    • Eddie cheats on Chance.
    • Noah cheats on Wade.
    • Wade cheats on Dre.
  • Gwen has an affair with Owen in Torchwood. She feels really guilty about it, though, and tells Rhys... after spiking his drink with Retcon. While she wants to hear him forgive her, she doesn't really want this to end their relationship. She ends up breaking off the affair and marrying Rhys.
  • Much of the drama in Flash Forward is derived from Mark's wife Olivia having a vision of herself with another man in six months' time. Eventually, it destroys her marriage.
  • A standard plot-line in Gossip Girl with literally too many instances to list and many of them too complicated to explain.
    • Dan Humphrey. He's cheated on three out of four girlfriends.
  • It would be easier to list the characters who have been faithful on The Secret Life of the American Teenager than list the many instances of cheating.
  • Taub of House is a big offender, despite his efforts to stay faithful to his wife.
  • The New Normal: Goldie catches her husband sleeping with an Asian woman.
  • M*A*S*H:
    • The early take a pretty casual attitude towards adultery. Henry Blake, Trapper John McIntyre, and Frank Burns are all married men who are having affairs while serving in Korea.
    • Conversely, in a season 6 episode B.J. Hunnicutt cheats on his wife and feels terrible as a result.
    • It's also revealed that Major Houlihan's husband has been cheating on her when he sends her a letter he intended for his lover.
    • The subplot of one episode dealt with a man furious to receive a letter from his wife admitting to sleeping with another man and begging forgiveness. BJ is less than impressed when he finds out that the man himself has a Korean girlfriend.
    • In one episode, Colonel Potter finds out by chance that his son-in-law cheated on his wife, and Potter gets angry and is distressed because of his daughter who is oblivious. The affair remains secret and the marriage is not affected (at that moment).
  • The Tudors has a lot of this. Henry cheats on his first three wives: Katherine of Aragon takes it stoically, Anne Boleyn blows up over it, and Jane Seymour actually doesn't seem that bothered - she is perhaps remembering that Anne Boleyn got her head cut off and is therefore being cautious. Plus, is was perfectly normal and socially acceptable for a man in Henry's position to have multiple mistresses, so whether it would actually be considered as "cheating" by the standards of the time is debateable. Needless to say, the same rule did not apply for married women. Wife no. 5, Katherine Howard cheats on Henry with Thomas Culpepper, and is executed for it. Part of what ruins the Charles Brandon/Princess Margaret marriage is that Charles can't be faithful. Both of the gay couples on the show involve married men, so they're cheating on their wives. Technically Ursula Misseldon was cheating on her fiance with Francis Bryan and Henry. Anne Stanhope cheats on Edward Seymour twice, first with Francis Bryan and then with his own brother, Thomas (though we never know for sure if Edward knows about the second). She also flirts with the Earl of Surrey, but Edward seems to have been encouraging that one... It's also inverted, since Anne Boleyn gets executed for adultery when she didn't cheat on Henry. 90% of this is truthful account; if anything there was more screwing around in Henry's court than the show portrays.
  • In The Mentalist, Bosco's utter devotion to Lisbon is played completely sympathetically, even though he is married. It may help that Lisbon is stoutly convinced that Bosco doesn't love her back, and actually cites his wife as a reason. Turns out she was wrong. Which she discovers as he is dying.
  • The Wire:
    • Jimmy McNulty is the personification of this trope. The series begins as his marriage is over and he and his former wife try to arrange their life as divorced people.
  • Kima gets there too, after spending too much time around McNulty. She cheats on her girlfriend and starts sleeping around.
  • CSI NY:
  • CSI:
    • Subverted. It did look like Doc Robbins' wife was cheating, but it turned out to be a set-up involving a disgruntled, arguably Ax-Crazy guy looking to off a genealogist who pulled up some dirty family secrets on him and Mrs. Robbins just happened to be said genealogist's next client.
    • Played straight in Brass's backstory. It was a double cheat, since they were both cheating on each other. Ellie resulted from the wife's affair.
  • The Sopranos Tony Soprano is a walking adulterer. The wife kind of tolerates it until he cheats on her with a one-legged woman, an ultimate humiliation. Generally speaking, many of the gangsters are noted adulterers.
  • Mad Men: Don Draper is the quintessential cheater. His wife is very anxious, feeling that their relationship is not right even before she finds out the truth. In fact almost all the characters on the show cheated on his/her spouse or had an affair with a married person. Ken Cosgrove stands out as a character because he is Happily Married, is never shown to stray and often prioritizes his family over work.
  • Buffy the Vampire Slayer:
    • Willow and Xander cheat with each other on Oz and Cordelia, respectively. They don't have sex, but these are high school relationships, so making out is as far as anyone is going. They are eventually discovered. Cordelia breaks up with Xander, and temporarily leaves the Scooby Gang. Oz eventually forgives Willow. Both Willow and Xander remained sympathetic, mostly because they were very distraught over their powerful attraction to one another.
    • Oz cheated on Willow in Season Four with fellow werewolf Veruca. This time, sex was involved, but because Oz was a werewolf when the cheating took place, and not in control of his actions he was plainly and visibly struggling with mating urges the wolf inside him was feeling toward the wolf in Veruca, which partially explains why he had to bring her into the cage with him. The other part is that she would have gone on a killing spree otherwise. Before the normal drama could play out, the plot got supernatural, and Oz killed Veruca to prevent her from killing Willow. Oz went away, and Willow went gay.
    • Willow with Aluwyn in Season 8. Kennedy never finds out about it.
    • Drusilla cheats on Spike five times all in all, once with a chaos demon, another time with a fungus demon, once with Darla and the immortal and twice with Angel.
    • Implied with Hank, Buffy's Disappeared Dad.
    • Buffy being bitten by Dracula, and Riley Finn being bitten by vampire prostitutes, is regarded as infidelity by both parties; when Buffy finds out about the latter, it causes the break-up of the Summers/Finn relationship.
  • In the episode "Family 8108" from Cold Case, it appeared that the Japanese father cheated on his wife as he caught kissing the school teacher who worked at the internment camp. However, it was averted as that was all they did and the husband told the teacher right away that he loved his wife and the teacher understood. But nevertheless, it spurned his son to join the army out of spite for his father.
    • In "Sanctuary", Scotty Valens was involved with the victim in the case, even though in the flashbacks she mentioned that he had a girlfriend already (implied to be Elisa). Later in the series, Scotty dated Frankie Rafferty, not realizing she was married until her husband confronted him.
  • Finely subverted in The District: The mayor is spotted having discreet meetings with a young Asian-looking woman. Turns out she is his illegitimate daughter from when he was serving in Vietnam.
  • In the fifth season of Charmed, Paige briefly dated a guy until she found out he was married with two little children.
  • This is the basis for the iCarly / Victorious Crossover. Carly's boyfriend Steven has been cheating on her with Tori and vice versa, and enjoying it. Carly ends up finding out the truth and teaming up with Tori to humiliate the cheater live on the internet.
  • The writers of Glee have gotten a lot of flack for seemingly thinking that the only way to create drama or break up a couple is to have the involved parties cheat on each other. Many fans feel that the cheating storyline has gotten very old because they use it time and time again, when there are so many other interesting ways a relationship can fall apart:
    • The show starts off with Will & Emma falling in love despite Will being married to (and thinking he's having a baby with) Terri. Before long this becomes not only Will as a cheater but also Emma, as she's dating & then engaged to Ken. They almost-kiss multiple times and there are scenes of Terri & Ken being jealous of Will & Emma. It is an emotional affair.
    • In season 1, episode 2, Finn kisses Rachel despite the fact that he's dating Quinn. Rachel kisses him in 1x05 when he's still dating Quinn plus he now knows she's pregnant. Quinn feels very jealous of any times Finn & Rachel seem close throughout all of the first half of season 1 while she is still dating Finn.
    • In episode 1x14 Will cheats on Emma by having a heavy make-out session with Shelby.
    • Both girlfriends Finn has had have not only cheated with him, but cheated on him with Puck.
    • Quinn cheats on a second boyfriend of hers as well- she cheats on Sam with Finn in season 2.
    • Brittany cheats on Artie with Santana - because Santana convinces her its not cheating because the plumbing is different.
    • In season 3, Beiste feels she is being cheated on by her boyfriend, Cooter. He just thought she wasn't that interested in him and was moving on.
    • In one of the more dramatic instances, Blaine cheats on Kurt in season 4 and it breaks them up and leads to both of them feeling insanely devastated.
    • In 4x14, even though Ryder is close friends with Jake, he kisses Jake's girlfriend Marley. She does, in the next episode, tearfully confess this to Jake in addition to admitting "and I let him".
    • Occurs once more in season 5 when Jake cheats on Marley with Bree because she wouldn't have sex with him.
  • New Girl:
    • As part of the show's premise, Jess returns home early in hopes of surprising her live-in boyfriend, only to find him cheating with another woman. This leads to her breakup and search for a new apartment.
    • In Season 3, Schmidt is dating both Elizabeth and Cece, trying to keep it hidden from both of them and unfortunately getting his roommates involved.
  • Cheers:
    • Frasier's wife Lilith cheated on him back in right before she dumped him for the man she was cheating on him with, which caused Frasier to nearly commit suicide and earned her several years of unrelenting wrath from Niles and Martin.
    • In a very different spin on this trope, Hester Crane also cheated on Martin decades ago, but the two of them overcame the incident and had an otherwise very happy marriage.
    • Niles' wife Maris on Frasier with their marriage counsellor of all people, and just a few scant weeks after she had undeservedly managed to cajole Niles into returning to her, to boot. This was particularly devastating to him, since he himself had struggled with an attraction to Daphne for years but always quashed it and remained steadfastly faithful while he and Maris were together.
  • Joan of Arcadia:
    • Joan suspects her boyfriend Adam and her best friend Judith are having an affair when she witnesses them hug. Turns out it was all platonic.
    • Joan also gets jealous when he hires an attractive, perky blonde assistant for his work and ends up being the first to actually cheat on him - she is a senior in high school and kisses her college-aged tutor, Roger. She feels very guilty and confesses. They don't break up over this.
    • Adam ends up cheating on Joan by sleeping with Bonnie, an artist he meets. He thought it could just be sex. Joan wasn't sleeping with him for some reason (she wasn't ready to lose her virginity yet) and his excuse is that he was just that desperate for sex. They break up near the end of the series over this.
    • A more borderline case on the show would be when Will has an emotional affair with his boss. He didn't really cheat on her. He almost did.
  • Necessary Roughness starts off when Dani finds out that her husband has been having affairs right under her nose and has even been using the guest bedroom in their house for it. She promptly kicks him out of the house and files for divorce.
  • Hannah Montana:
    • The romantic story arc between Miley and Jake Ryan comes to an end in season four, when Oliver takes a photo of Jake nibbling the ear of a female co-star during a movie shoot. Oliver and Lilly try to hide this from Miley, but she finds out eventually while shooting a Christmas special she and Jake from a boy extra who accidentally reveals the secret when Lilly and Oliver are talking to her. She retaliates by beating up Jake on camera.
    • A season 3 episode has Oliver practice saying "I love you" to an unconscious Miley in the hospital (she injures herself in a skiing accident in the episode's open); Miley's subconscious self overhears him in an out-of-body experience and thinks Oliver is cheating on Lilly with her. Miley's disgust for Oliver (mixed with Lilly's overbearing sadness at finding out, and Miley's flattery that Oliver is attracted to her) are Played for Laughs for much of the rest of the episode, along with Miley's attempts to encourage a still-emotional, makeup-streaked Lilly to find another boyfriend at the beach. Naturally, Lilly and Oliver reconcile, and are upset with Miley.
  • In Good Luck Charlie this happens to Teddy. It turns out Spencer had told Teddy that Skyler was his cousin and vice versa, it doesn't end well for him. Teddy eventually forgives Spencer and they get back together, while Skyler gets together with PJ, Teddy's brother.
  • The infamous Love Triangle of Arthur, Guinevere and Lancelot is dealt with in a unique way in Merlin. Gwen and Lance were each other's First Love, but because of circumstances they never had a chance to get together properly. Guinevere eventually falls in love and gets engaged to Arthur, only for Morgana to send a Brainwashed Lancelot to the celebrations in order to confuse and upset Guinevere. When Gwen doesn't react to Lancelot's return, Morgana ensures she is Mind Raped by an enchanted bracelet and ends up caught in a compromising situation with him. Even Guinevere doesn't understand why she acted the way she did, and the real tragedy is that she admits that she did once have feelings for Lancelot, as did Lancelot for her - but the audience knows both were too noble and too devoted to Arthur to ever even consider acting upon them.
  • How I Met Your Mother:
    • Ted's highschool sweetheart Karen, whom he dated off and on throughout college was most notorious for cheating on him constantly, fueling their endless cycle of break-ups and make-ups. This caused Lily and Marshall to develop a vendetta-like hatred of her and give Ted a lot of flack for repeatedly taking her back.
    • In the season 3 episode Slapsgiving, Robin cheats on her current boyfriend with her ex boyfriend Ted.
    • In season 7, this happens to both Barney and Robin who cheated on their respective girlfriend and boyfriend at the time. The nightmarish situation was nicely summed up as "Well, I'm stuck on a boat with the guy I cheated with, the guy I cheated on, and the girl who the guy I cheated with, cheated on, so no, I'm not doing so good."
    • Way before he met the gang, Barney was deeply in love with his long-time girlfriend Shannon who he would have married if he didn't find out she cheated on him with a suit-wearing jerk, prompting Barney to start wearing suits.
    • Subverted when Ted thinks that his father is cheating on his mother. It turns out not to be cheating because Ted's parents have been divorced for a while and they failed to inform Ted of the fact.
    • In season 9, Barney's brother James is divorcing his husband because he had an affair with a man named Gary Blauman. They reconcile by the end of the season.
  • That '70s Show:
    • This was a fairly prominent part of Jackie and Kelso's relationship. Note nearly all of the affairs are one night stands.
    • Kelso would cheat often and freely without Jackie ever suspecting a thing. One affair in particular - the one with Eric's sister - becomes more a relationship than just a one night stand like the others and is the one he is caught in.
    • Jackie's turn: Later, she kisses The Cheese Guy, which Kelso fails to see the irony in. This is lampshaded:
      Kelso: Alright, look. Jackie, here's the deal, you cheated on me.
      Jackie: You used to cheat on me all the time.
      Kelso: Yeah? Well, yeah. But you cheated out of hate, and I cheated out of joy.
    • Later still, Jackie and Hyde start dating and Hyde thinks Jackie is cheating on him and in response actually does cheat on her.
  • Once Upon a Time:
    • In the Real World, Mary Margaret (Snow White) and David (Prince Charming) start having an affair while David is married to another woman. They are found out, and Mary is ostracized for it. There is much debate over whether this "counts" as cheating since the two are meant to be together, but as they aren't aware of the fact that they're supposed to be married, it is still cheating.
    • Milah fell in love with Captain Hook and left her husband and young child to be with him, faking a kidnapping from Hook and leading her family to assume she was dead. When her husband found out she was not only alive but cheated on him with Hook, he ripped her cheating heart from her chest. Literally.
  • Infidelity and people's attempts to cover up or get revenge for said infidelity is a frequent plot point in Person of Interest.
  • China Beach had several characters who considered themselves "geographically single."
  • Friends has various examples.
    • The biggest one known to fans is between Ross and Rachel. After they get into a huge fight, they decide to "go on a break" (although what is meant by this is a point of contention and both seem to flip-flop between meanings). Ross calls her to make up that same night and the phone is answered by her guy friend they had been fighting over. He interprets this as confirmation of her cheating/immediately-moving-moving-on, so he gets drunk and has sex with the copy machine girl in order to cope. When Rachel finds out, it leads to the biggest heartbreak between the two of them and a strained relationship for the next several seasons.
    • Rachel and Ross are drawn to each other even though they date other people. The two of them kiss while Ross is dating other girls such as Julie and Bonnie. They're not a good pair when it comes to this trope.
    • Joey's parents. Joey discovers his father has a mistress and gets angry at him, demanding that he go make things right with his mother. The following day, Joey's mother stops by and gives him an earful for what he did because she was actually happier that her husband was cheating, which in turn made him happy since the two of them were miserable being faithful to each other.
    • Joey himself dates multiple women at a time. He's very casual about his relationships.
    • Phoebe kissed her ex-boyfriend David while she was with Mike. Mike and David were Phoebe's greatest loves.
    • Mike proposes to Phoebe while he dates a woman named Precious. She knows Phoebe is the love of Mike's life. Mike breaks it off with Precious as soon as he gets the chance.
    • In one episode, Chandler dates a beautiful woman and is very surprised when he finds out she's married. She insists that her husband is ok with it, and they continue dating with no-strings-attached. Chandler, being afraid of commitment, initially enjoys this arrangement but becomes uncomfortable as their relationship continues and develops, especially when he finds out she has another lover beside him. Chandler realizes he actually wants a committed relationship. They break up.
    • One rather big arc involved several instances with many broken hearts. Chandler falls in love with Joey's girlfriend Kathy and while Joey was mostly casual about his relationships, he likes Kathy and decides to be with her for a bit longer and considers going steady with her. She likes Joey well enough but finds she has a deeper connection with Chandler, who is absolutely crazy about Kathy and suffers a lot trying to suppress his affection for her for Joey's sake. Chandler and Kathy kiss once and Joey is very upset when he discovers this. Kathy then wants to break up, not wishing to pursue a relationship with either Chandler or Joey because she feels it would separate them and would be too hard on all of them. When Joey realizes how much Chandler cares for Kathy, he green-lights the relationship. Chandler and Kathy are happy and perfect together for some time, but later, Chandler becomes insanely jealous of Kathy's theatre colleague. They have a fight and she slept with said colleague. He is devastated when he learns about this, going into Heroic B.S.O.D. for the next few episodes. Love Hurts.
    • Chandler's previous girlfriend Janice cheated on him with her ex-husband. When he found out, he was heartbroken but told her to go back to her ex because they had a kid and he didn't want to break up a family. This was a call back to the fact his parents also cheated on each other throughout his childhood. When you're Chandler Bing Love Hurts badly.
    • Thankfully Chandler ends up with the dependable Monica, the only Friend not to have cheated in any way. After they've got together, he panics about an Imaginary Love Triangle and thinks she's fallen into this trope (understandable given Your Cheating Heart seems to have made him a personal target) but she never does anything close and helps him through the issues caused by the truckload of previously mentioned betrayals.
  • The bread and blood of the reality show Cheaters. Because having someone cheat on their significant other is horrible and unforgivable, but encouraging the cheated-on person to have the other stalked around for almost two weeks instead of immediately confronting them is a-okay.
  • In Farscape, Chiana cheats on D'Argo with his son. She is presented somewhat sympathetically when she explains that she did it because she couldn't handle the amount of commitment D'Argo was trying to force on her. Understandably, Jothee leaves the ship and the relationship between D'Argo and Chiana remains strained for quite some time.
  • In The Office (US) when Angela was engaged to Andy, she frequently cheated on him with Dwight with little remorse. She later wanted to take a hit out on Oscar when she found out he was having an affair with her husband. Something even Dwight had to call her out on.
  • Monday Mornings: Dr. Tina Ridgeway's marriage is a mess and falls apart. It's not absolutely crystal clear whether she slept with her colleague before or after she and Mark broke up, but she probably did cheat. When she tells her husband that she's having an affair, he files for divorce and blames her for destroying their marriage. However, he blames her lover even more and sues him.
  • JAG: In "Pilot Error", Lt. Pendry was very close to his female wingman, Lt. McKee, leading to many rumors that the two had an affair. Harm, McKee, and Pendry's widow all insist that no affair took place, for different reasons (Harm refuses to believe his friend would have done such a thing, McKee admits to having had feelings for him, but knew it wasn't meant to be, and Pendry's wife insists that their relationship was too strong for such a thing to happen.) McKee did have an affair... with her commanding officer, but not with Pendry.
  • Happens a lot in Grey's Anatomy:
    • Before the series started, Addison cheated on her husband Derek with his best friend (Mark Sloane), prompting him to leave New York and run away to Seattle. In season 1, Derek dated Meredith while still being married. When Addison tracks him down, she reveals this to Meredith, they break up, and Derek gets back together with his wife, only to cheat on her with Meredith. Being the Official Couple, Meredith and Derek are portrayed more sympathetically than the others.
    • Chief Richard Webber and Ellis Grey (Meredith's mother) both cheated on their spouses with each other in The '80s, though broke it off when he chose his wife Adele over her. In season 8, Adele cheats on Richard with a man at her nursing home, though this time it's justified as her Alzheimer's Dementia was so advanced that she didn't even remember her husband. Richard then decides it's all right for him to date Catherine Avery, whose advances he had been resisting out of respect for his wife. He still loves his wife and feels guilty about not visiting her after that.
    • George's girlfriend Olivia cheated on him with Alex, who was cheating on Izzie with her, which caused George to complain about Alex giving him syphilis. This gained Olivia the In-Series Nickname "Syph Nurse".
    • In season 3, George cheats on then-wife Callie with Izzie.
    • Alex's relationship with Rebecca/Ava could theoretically count: it is not clear whether Rebecca's husband left her before or after the relationship started.
    • Double Subverted with Owen in season 8. Cristina suspects he's been cheating on her with a nurse (Summer Glau) who flirts with him, though it turned he hasn't. Later it's revealed that he actually did cheat on her once, but with a complete stranger rather than the nurse.
    • The end of season 9 has Arizona cheat on Callie with a visiting doctor she had UST with. It ruined their relationship, though in season 10 they began marriage counseling.
    • Season 10 has a dying patient who tells on the doctors that if she dies to tell her husband that she cheated on him with his brother. The doctors on her case wonder whether or not to tell the husband, though Callie, who just found out about Arizona's infidelity, insists that they should be honest with him. Then she realizes having his wife die was painful enough, and decides not to tell him about the cheating.
  • In The Hour, Hector has an affair with Bel. Later, his wife Marnie reveals that not only does she know about him and Bel, but apparently, this is a pretty regular thing. Bel breaks it off with him, but in the next season, he's back to cheating with other women. In the Season Two finale, Marnie reveals she's pregnant, which, since Hector is pretty sure he's infertile, implies she's been returning the favour.
  • In You're The Worst, Lindsay cheats on her husband with a 19 years old writer, and feels really guilty about it.
    Lindsay: There's wife-Lindsay who helps Paul with gravestone rubbings on his genealogy trips, and then there's adulteress-Lindsay who just wants to sit on everyone's face.
  • In Orphan Black, Alison has sex in her minivan with her best friend's husband Chad—and it's not the first affair he's ever had, either.
    • Later, at Alison's intervention, she tells everyone that Aynesley "blew the roofer" of their vacation cabin.
  • The Affair revolves around this, exploring the extramarital relationship between Noah Solloway and Alison Lockhart.
  • In the first episode of Galavant, Madalena dumps the title character for King Richard for the money that comes with being queen. She then cheats on King Richard with a jester.
  • Many of the victims in Supernatural were having an affair. This pattern is established in the pilot, when the Woman in White targets men who cheat.
  • The second episode of iZombie has Liv discover that the victim of the week (an artist) was sleeping with one of his models. Naturally, the detective immediately assumes the wife killed him. They to go confront her, only for the wife to introduce her to her friend - the same model, whom the wife introduces as one of her husband's favorite lovers. She explains that they had an open marriage and that she didn't mind him sleeping around. However, it's revealed that her husband got one of his conquests pregnant... and then decided to leave his wife to start a family with the girl. It turns out the detective really was right about "it's always the spouse".
  • The Astronaut Wives Club has a fair bit of this:
    • Pre-series, Gordo and Alan both strayed from their wives, with Alan implied to be a repeat offender.
    • Several of the astronauts are implied to have had flings of varying degrees with the Cookies, women who hang around the cape and hotels, hoping to have a fling.
    • Narrowly averted by Louise with Max- despite serious tension, real affection, and several chances, there is no full blown affair.
  • In Defiance, Datak Tarr has no problem regularly visiting the brothel NeedWant and screwing his servant. He doesn't even bother hiding it from his wife, implying it's a common Double Standard among the Castithans. At the same time, when he finds out that his wife Stahma has been secretly seeing the same prostitute, he threatens to kill his wife unless she demonstrates her loyalty (she does that by killing the prostitute, even though Datak later claims he only wanted her put in her place not killed). Their son Alak, married to a human girl, ends up having a short-lived affair with another prostitute (who deliberately tries to drive a wedge between the couple, hoping that Alak might be her Prince Charming). He then tries to break it off, claiming that he loves his wife, who is expecting his child, but the prostitute won't back off and uses her friendship with his wife to continue her plan. Stahma is smart enough to know that Alak's wife, being a human, won't tolerate infidelity and takes measures to protect her son's marriage.
  • The Enemy at the Door episode "The Polish Affaire" revolves around a couple who have to deal with the sudden and unexpected reappearance in their lives of a friend from before the War who was secretly carrying on an affair with the wife. It turns out in the end that the husband knew about the affair all along, and chose not to make an issue of it, but finds that it complicates his motives in dealing with the present situation.
  • ER. Mark Greene's wife cheats on him and leaves him for the other man. Much like the "Niles" example in Frasier, this is especially bad as not only was she having the affair at a time when he believed they were reconciling and trying to save their faltering marriage, she was doing so while giving him grief about his friendship with another woman.
  • Tyrant: Leila reveals to Cameron that she had an affair with Barry while she was engaged to Jamal, who is really his father. Barry in the present has sex with Deliyah just after Molly attempted suicide, and has gone to a clinic in Germany for treating her depression.
  • The Family: John engaged in an affair with Nina, plus having sex with numerous other women he met on his "dealing with grief" tours. Also invoked by Willa to explain why Ben's DNA doesn't match John, claiming he's the result of an affair which Claire had.
  • The Magicians: Quentin cheats on Alice with Eliot and Margo while high on emotion magic. Alice later has sex with Penny in revenge. Julia sleeps with Pete in order to gain access to a second safehouse, despite still being engaged at the time.
  • Several characters on Good Girls Revolt cheat on their significant others over the course of the first season, including Cindy on Lenny with Ned, Pattie on Doug with Finn, and Naomi on her husband with Sam.
  • Subverted in Game of Thrones: Ned Stark never actually broke his vows to his wife Catelyn by fathering Jon Snow out of wedlock. Jon Snow is Ned's nephew, son of Ned's sister Lyanna Stark and Prince Rhaegar Targaryen, born toward the end of Robert's Rebellion. Ned returns home with his infant nephew, names him Jon, and raises Jon as his own child, passing him off as his illegitimate son to protect him from King Robert Baratheon, who would surely have him murdered due to being born of the Targaryen bloodline.
  • No Tomorrow: Xavier's grudge against his father turns out to be because he had an affair with another women while his mother was dying. In fact, he met the other woman at a support group for people who had dying relatives.
  • Occurs frequently in the first season of Queen Sugar:
    • Nova is seeing married man at the start of the series, though they break up halfway through the first season. Toward the end of the season, though, he leaves his family for her and they get back together.
    • Charley's husband had a mistress named Melina Gold. Just prior to the beginning of the season he let his teammates gangrape her and she threatens to go public about their whole affair.
    • Ernest, the Bordelon patriarch, cheated on Nova and Ralph Angel's mother to conceived Charley. She grew up primarily with her mother.
    • Hollywood had a wife the whole time he was with Vi. They had been separated for years, ever since her mental breakdown, but were still technically married.
    • Micah learns that his girlfriend Stella had been cheating on him after nude pictures of another boy were found on her phone.
    • Subverted with Charley and Remy. Despite their mutual attraction, they don't get together until after she files for divorce from her husband.

  • As you might expect, cheating songs are quite common in Country Music, considering the old saying about country: "My dog died and my woman left me, pour the whiskey."
    • "Your Cheatin' Heart" by Hank Williams is the Trope Namer and provided previous page quote. This one is a classic and has been covered by everyone from fellow country artists Patsy Cline and Le Ann Rimes to Van Morrison to Fats Domino to James Brown to The The.
    • "Lady Down On Love" by Alabama.
    • "The Thunder Rolls" by Garth Brooks.
    • "The Night Will Only Know," another Garth Brooks song, is about two people married to other people who have a one-night stand and end up witnessing a murder.
    • "Papa Loved Mama," also by Garth Brooks, is about a trucker who learned that his wife slept around while he was away, so he got in his big rig and ran his wife and her paramour over... while they were still in the motel.
    • Lefty Frizzell's "The Long Black Veil" features a dead narrator who was falsely accused of a murder and chose to hang for the crime rather than reveal his alibi (he'd been with his best friend's wife on the night in question).
    • "In Another's Eyes", a duet by Garth Brooks and Trisha Yearwood (though this one is more about two people who are trying not to cheat).
    • "Revenge of a Middle Aged Woman" by Tracy Byrd.
    • "Lyin' Eyes" by the Eagles.
    • "Carolyn" by Merle Haggard.
    • "Have Mercy" by The Judds.
    • "Heaven's Just A Sin Away" by The Kendalls.
    • "The Night the Lights Went Out in Georgia" by Vicki Lawrence (later revived in a cover by Reba McEntire).
    • "Who's Cheatin' Who" by Charly McClain (later revived in a cover by Alan Jackson)
    • "Jolene" by Dolly Parton (a rare instance of the song being from the point of view of the person about to be cheated on)
    • "Ruby, Don't Take Your Love to Town" by Kenny Rogers.
    • "Should've Said No" by Taylor Swift.
    • "Here's A Quarter (Call Someone Who Cares)" by Travis Tritt.
    • "I May Hate Myself in the Morning" by Lee Ann Womack.
    • "Cheater, Cheater" by Joey + Rory, wherein the female asks why her man was cheating.
    • ...same with "Cheatin'" by Sara Evans.
    • "Does He Love You" by Reba McEntire and Linda Davis is sung by the wife and the 'other woman'.
    • Reba: "Whoever's In New England" and "It's Your Call." Both involve a wife aware of her husband's cheating - the first says, "You'll always have a place to come back to, when whoever's in New England's through with you," and the second has the lover calling the house.
    • Reba: "Little Rock," which involves a woman deciding to cheat because the marriage fires have dwindled.
    • "Before He Cheats" by Carrie Underwood. It went double-platinum. However it's possible he hasn't even cheated, like the title implies.
    • "Stay" by Sugarland and "From a Table Away" by Sunny Sweeney are rare examples from the other woman's POV.
      • Jennifer Nettles, one-half of Sugarland, released a twist on the formula in "That Girl". The woman in the song unintentionally has an affair with a man who didn't let on that he was already married, so she consults his wife and tells her "I don't wanna be that girl".
    • "The Way We Make A Broken Heart" by Roseanne Cash is another example from the other woman's POV.
    • "Long Black Veil" by Johnny Cash, where the POV singer is hung for murdering his best friend because he couldn't bear to reveal his alibi (he was sleeping with his friend's wife at the time).
    • An unusual Played for Laughs version is "You Can't Have Your Kate and Edith Too" by The Statler Brothers
    • "On the Other Hand" by Randy Travis, where the man contemplates an affair.
    • "Married but Not to Each Other" by Barbara Mandrell, with two cheating spouses.
  • "Me and Mrs. Jones" by Billy Paul
  • "Woman, Woman", by Gary Puckett and the Union Gap, is sung from the POV of a guy who suspects this may be going on.
  • "Your Time Is Gonna Come" by Led Zeppelin
  • English boy band Big Fun's most famous song, "A Handfull of Promises", deals with a man having a breakdown after he finds out that his girlfriend is cheating on him and everyone knew what was going on. And it's a cute, catchy 90's pop song.
  • Unusually for her genre, Halsey implies that she's the Other Woman in "Is There Somewhere".
    ''You're writing lines about me; romantic poetry.
    Your girl's got red in her cheeks 'cause we're something she can't see.
    And I try to refrain, but you're stuck in my brain,
    And all I do is cry and complain because second's not the same.''
  • The Murder Ballad "Matty Groves" revolves around the titular character spending the night with a nobleman's wife, only to have the nobleman himself come home early (thanks to a tattletale servant). The nobleman kills Matty Groves right away, then asks his wife which man she prefers. When she defiantly answers "I'd rather a kiss from dead Matty's lips than you or your finery," he kills her too.
  • "Lips of an Angel" by Hinder, which has been Covered Up by country singer Jack Ingram to some audiences, is about a man calling his ex while his new girlfriend is in the next room.
  • "Lying" by Amy Meredith
  • Glasvegas' "It's My Own Cheating Heart That Makes Me Cry," which never quite makes its mind up as to which side it's on (the relationship is certainly screwed, but it's tricky to tell whether it's because he cheated or because he's completely petrified about her cheating, or both, or neither, or...). In a cross between Soundtrack Dissonance and Foreshadowing, it appears in Skins when Naomi And Emily finally get together and Thomas And Pandora reconcile in S3's penultimate episode; by the time they get two episodes into S4 though... well, see the Skins list in Live Action TV above.
  • Whitney Houston's “Saving All My Love For You” deconstructs this trope from the other woman’s perspective, expressing how sad and hopeless it is to be in love with a married man but unable to find anyone more compatible.
    You used to tell me we’d run away together
    “Love gives you the right to be free”
    You said, “Be patient, just wait a little longer”
    But that’s just an old fantasy!
  • The Veronicas:
    • Revenge Is Sweeter (Then You Ever Were), Everything I'm Not, Did Ya Think".
    • "All I Have" is from the perspective of the cheater
  • "The Long Black Veil"
  • "Over the Hills and Far Away," a folk ballad by Gary Moore covered by Nightwish and Thyrfing, has a similar plot to "The Long Black Veil," with the protagonist unable to confess his innocence to a robbery because of spending the night with the wife of his best friend and having to go to prison.
  • "Wake Up Dead" by Megadeth is about a married man sneaking back home late at night, after seeing his 'other lover' named Diana.
  • Two Wham! songs deal with cheating in various ways — "Last Christmas" features a protagonist who's just broken up with his partner because his partner cheated on him, but "this year to save" the protagonist "from tears" on Christmas, he'll give his heart "to someone special". Then there's "Careless Whisper", a song where the protagonist is the cheater and is feeling extremely guilty about having done so. ("Guilty feet have got no rhythm", "Should've known better than to cheat a friend/The wasted chance that I've been given", etc.)
  • Duran Duran's 1981 song "Careless Memories" deals with the protagonist's anger at having found out about his partner's cheating on him and how disgusted he is with said partner. He even regards the exchanges of love and devotion that went on during the relationship as "careless memories."
  • "The Other Man" by Canadian band Sloan, based on Chris Murphy's relationship with Feist, who was also dating Andrew Whiteman of Broken Social Scene at the time.
  • "My Big Mistake" by Delta Goodrem.
  • "Kiss N Tell" by Kesha.
  • "Womanizer" by Britney Spears and as being the cheater in He About To Lose Me
  • Vanessa Amorosi: "Sleep With That" and "Blow Me Away".
  • The infamous and massively memetic song "El Venao" by Los Cantantes, in which the protagonist tries to fend off all the rumors about his girlfriend cheating with him with many others. Played completely for the lulz.
  • "Lately" and "Part-Time Lover" by Stevie Wonder.
  • "Save It For The Bedroom" by You Me At Six is another example where the singer is the one cheating: "Keep your hands to yourself,these lips belong to someone else..."
  • “O.P.P.” by Naughty by Nature is an ode to this trope.
  • "Escape (The Pina Colada Song)" is a strange example. A man decides to cheat on his wife with an unknown woman who posted an ad in the paper looking for romance. He arranges to meet with her by sending a reply message to the paper, and when he reaches the rendezvous, he discovers that the woman he plans to cheat on his wife with is... his wife. Strangely, catching each other trying to cheat on each other revitalizes their marriage instead of destroying it.
  • "You Know I'm No Good" by Amy Winehouse is sung from the cheater's perspective- she loves her partner but has trouble staying faithful. "You say when we marry 'cause you're not bitter/There'll be none of him no more/I cry for you on the kitchen floor"
  • Backstreet Boys's The Call is about a man who cheats on his girlfriend during a party. Made even more obvious in the music video, where the five band members are chased around by a beautiful woman who seems to be the incarnation of the guilt the narrator feels.
  • In Pepe Deluxé's Queen of the Wave, the hero Zailm's downfall comes about because he begins an affair with Lolix, "leading to duplicity with Anzimee [his wife] and a strange blindness to the wrong he has committed."
  • "Who Is It?" by Michael Jackson
  • "It Wasn't Me" by Shaggy is an interesting example. The song's protagonist was just caught cheating and goes to Shaggy for advice. Said advice ranges from hoping she'll forget, to flat-out denying, to hoping she doesn't have a gun. In the end the protagonist decides to ignore all of Shaggy's advice and man up to what he's done, showing that there may still be hope for their relationship.
  • “Creep” by TLC describes how the singer is cheating on her boyfriend, because he is cheating on her. Yet she doesn’t do this out of revenge, but rather because she needs the emotional support in order to stay in the relationship.
  • "Smile" by Lily Allen is about a woman who takes a systematic revenge on her cheating ex, which includes getting him beaten up, putting laxative in his coffee and having his stuff in his apartment destroyed, including his precious LPs.
  • The Mercedes Lackey song "Lovers Untrue" plays this trope for laughs. Verse 1: Boy and girl swear to be true to each other unto death. Verse 2: Boy starts courting second girl. Verse 3: Girl starts courting second boy. Verse 4: Boy and Girl 2 go on date and run into Girl and Boy 2 on date. Upon realizing they were both unfaithful, boy says "Well, I guess we must be dead!"
  • "Cheating" by John Newman, who sings as the partner of a serial cheater.
  • “Baby Baby” by the Miracles is a plea to take the singer back after he cheated.
  • "Does He Love You?" by Rilo Kiley.
  • "More Than You Deserve" by Meat Loaf is about a man who repeatedly caught his girlfriend making out with other guys.
  • "Adult Friends" by Xiu Xiu is from the cheater's perspective, and probably one of the most disturbing songs in the style.
  • "The Other Woman" by Ray Parker Jr.
  • "I Don't Wanna Know" by Mario Winans is about a man whose girlfriend is cheating on him, but contrary to most examples he doesn't want to know more about it.
  • Melanie Martinez has more than a few of these:
    • "Dollhouse" is about a family pulling a Happy Marriage Charade. The husband is cheating and the wife is depressed and an alcoholic due to it.
    • The sequel song "Sippy Cup" involves the wife confronting her husband and his mistress. "Confronting" as in "killing" that is.
    • The protagonist in "Pacify Her" is about a woman who is involved with a taken man.
  • The music video to "I'm Not Yours" by Angus And Julia Stone is about infidelity. It involves a Funny Animal cat whose husband has become distant and is never home. He keeps on using the excuse that he's busy at work but one day his wife finds him proposing to another cat. He's been living a double life. Eventually the "other woman" sees him on the street with his family and breaks up with him. The male cats wife leaves with their infant son and the video ends with him gazing down at the empty crib.
  • "If Loving You Is Wrong I Don't Want To Be Right" by Luther Ingram is about a married man who falls in love with someone.
  • All Saints' "One Strike" is taken straight from member Nicole Appleton's life: her husband, Liam Gallagher, had an affair with a reporter and got her pregnant as well. The song is about the call she got from him confessing to the affair.
  • "Wedding Dress" by Derek Webb is about the singer's relationship to Jesus Christ being like an unfaithful bride seeking out more than what the groom was going to give in the relationship when they become married.
  • "Spare Me the Details" by The Offspring is about a guy, who finds out that his girlfriend has gotten drunk and had sex with another guy at a party. As he's contemplating the end to the relationship and all his dreams of their future life together, he desperately wants his friends to stop telling him the juicy details of the sex, since they're just making it worse.
  • "I Know I'm not the Only One" by Sam Smith is about a woman who knows her husband is cheating. While she is heartbroken, she nevertheless stays with him without letting him know that she is aware of his infidelity.
  • “Let’s Get It On” by Marvin Gaye is a meta-example, as it is directed towards a real woman Gaye wants to have an affair with. Some of the lyrics hint at this.
    There’s nothing wrong with me loving you
    And giving yourself to me can never be wrong
    If the love is true
    • The woman is Nona Gaye’s mother, so the song does the job.
  • “Creep” by TLC describes how the singer is cheating on her boyfriend, because he is cheating on her. Yet she doesn’t do this out of revenge, but rather because she needs the emotional support in order to stay in the relationship.

    Myths & Religion 
  • Pick a Greek myth. Any Greek myth. From Zeus (married to his sister, Hera) seducing or outright raping everyone, male or female, to Aphrodite (married to long-suffering Hephaestus) and her relationship with Ares, to Paris eloping with Helen of Troy, the wife of Menelaus... no wonder there were so many children of questionable parentage running around.
  • Over in Norse mythology, we have Sif- married to Thor, and though it was never confirmed to be true or false, Loki at one point accused her of sleeping with him ("Only I know, as I think I do know/Your love besides Thor/And that was the wicked Loki!"). She says nothing, and then another goddess starts talking. And in an earlier myth, Odin (in disguise) said to Thor the equivalent of "Hey, no need to hurry home to your wife or anything, because she's got someone else to keep her bed warm!" Both times, Thor was understandably pissed.
  • In Japanese myths, the flower goddess and Mount Fuji patron Konohanasakuya-hime was accused of cheating on her husband Ninigi-no-mikoto, the grandson of Amaterasu, since she announced her pregnancy the day after their marriage. Her reply was to lock herself in a burning hut to give birth, saying that her baby wouldn't be hurt if they truly were the offspring of Ninigi. She was proved right... and gave birth to healthy triplets (Hoderi, Hosuseri, and Hoori).
  • King Arthur: Lancelot and Guinevere, the affair of which is often the cause of the fall of Camelot.
  • The Bible
    • God's people Israel is portrayed in the book of Ezekiel as an unwanted baby girl whom God raised up to be a lovely woman, whom He married and took good care of and made her even more beautiful, who ended up becoming unfaithful to her husband by having sex with other people, as a picture of how God's people had become unfaithful to Him and had given themselves over to idolatry.
    • Adultery in general is considered as a sin. The Book of Corinthian provides a detailed definition about this subject: In order to prevent sexual immorality, Paul insisted that marriage and a long-lasting relationship is a preferable solution. If the spouse is a non-believer and still follows a believer, the believer is not allowed to propose a divorce. The only two occasions where one can legitimately seek a Second Love is if the spouse was deceased (which ends the bond of marriage), or if a non-believer left the believer.
    • David commits adultery with Bathsheba and after several failed attempts to get her husband Uriah to go home and sleep with her (In order to make it seem that Uriah had conceived the child that resulted from their tryst), David decides to indirectly murder him using ....what else?. It works. Although considering the impossibility of hiding anything from God and the punishment that resulted from this sin, nobody would be blamed for saying that David Didn't Think This Through.
      • Later in Psalm, David begged God for forgiveness and cleanse his sin, right before delivering his own Prayer of Malice.
    • Jesus commanded a woman caught in the act of adultery not to sin anymore after the men who wanted to condemn and stone her to death left the scene upon being reminded that they also had sinned. He himself also said whoever lusted after a woman upon seeing her has committed adultery in his mind.

    Pro Wrestling 
  • Subverted in ECW when Beulah was found to be having an affair on Tommy Dreamer with another woman. After some apprehension, Dreamer declared he would take them both, because he's hardcore, though in the end he ended up with just Beulah.
  • Chyna broke with Eddie Guerrero after she found him in the shower with one of the Godfather's hoes. Their tag team partnership crumbled soon after their relationship.
  • WWE Raw had an angle where Lita cheated on Matt Hardy in order to protect him from Kane. Hardy wasn't grateful and wrestled Kane for the right to marry Lita. Hardy lost but Lita then cheated on Kane with Edge. After Lita retired, Edge then began having an affair with Vickie Guerrero, with The Big Show trying to get Guerrero to leave Edge for himself but what brought it an end was Edge attempting to cheat on her with their wedding planner Alicia Fox.
  • Buff E of the Christopher Street Connection named long time rival Matt Striker as his best man for his marriage to Tag Team partner Mace Mendoza but during the ceremony Striker had enough and announced that Buff E and himself had been having an affair. This lead Mendoza to admit he had also been cheating on Buff E with his maid of honor Dana Dameson and gotten her pregnant. The wedding was off but they agreed to keep working as a tag team.
  • Subverted while the Age Of The Fall was running in Ring of Honor. Jimmy Jacobs wasn't happy about Lacey cheating on him with Austin Aries but was willing to take her back, to prove he wasn't jealous and that love was more important than sex. Lacey, however, couldn't bring herself to do it.
  • During TNA's Christian Coalition-Angle Alliance feud, Kurt's wife Karen seduced AJ Styles to bring the former group under the control of the latter and Kurt for his part didn't care, at one point giving Karen to AJ so she wouldn't distract him from more important things like beating Samoa Joe. However, when Karen started cheating on Kurt with Jeff Jarrett, Kurt was less than pleased.

    Puppet Shows 
  • Used as a throwaway gag in The Great Muppet Caper.
    Gonzo: How about you folks? Souvenir photograph?
    Man: No thanks. No pictures.
    Gonzo: Oh, come on! It'll be a great momento for you and your wife.
    Man: My wife isn't feeling very well.
    Gonzo: Oh, that's too bad. Maybe she should be at home.
    Man: My wife IS at home!
    Gonzo: [stammers incoherently] Yes, uh... NEXT TABLE!

  • Our Miss Brooks: In "Four Fiancés ", Miss Enright, masquerading as Miss Brooks, corresponds in her name with four different men . . . and proposes marriage to each and every one of them! To get rid of her Texas fiancé, Miss Brooks pretends that Mr. Conklin (who had brought over Miss Enright to force an apology from her) is her straying husband and Miss Enright the other woman!

  • In Street Scene, Mrs. Maurrant is Cheating with the Milkman, who the neighbors point out is himself married with two children. Her daughter Rose is aggressively propositioned by her boss, Harry Easter, who tells her that his wife doesn't need to know about anything he's planning.
  • In Chicago, Roxie is cheating on her husband Amos with Fred Casely, a married man whom she shoots to death at the start of the play; Amos grudgingly stands by his wife until she decides to draw sympathy in her murder trial by pretending to be pregnant. The musical also has Cell Block Tango, which contains a minimum of four affairs, depending on how you count it.
  • In Allegro, when Joe moves to the big city, it turns out that his wife is cheating on him with Lansdale, the benefactor of the hospital he works for. He finds this out from Mrs. Lansdale, who's on her way to Divorce in Reno.
  • In Noh theatre, the bridge princess youkai is the eternally-jealous spirit of a noblewoman whose husband cheated her. Depending on the retelling, she either murdered or cursed him, and the gods turned her into a bridge-haunting youkai as punishment.
  • In A Shot in the Dark, it gradually emerges that while the first suspect was cheating on the victim with the master of the house, his wife was having an affair with his best friend. Sevigne helps make the point that while adultery "is not illegal—it's not even unpopular," murder is "certainly illegal, and probably unpopular."
  • Everyone in Harold Pinter's Betrayal.
  • In That Championship Season, Phil Romano and his wife Claire have a functionally open marriage. One of Phil's lovers is Marion Sitkowski, the wife of his friend, former high school basketball teammate, and current mayor George Sitkowski, who makes things easier for Phil's strip mining operations in exchange for generous campaign donations. When George's campaign manager, James Daley, tells George that one of his top campaign donors is also sleeping with his wife, George takes it so badly that he points a loaded rifle at Phil. Phil insists that Marion participated in the affair to further George's political career.
  • Offenbach's operetta La Belle Helene is a comedic retelling of the first stages of The Trojan War, in which Menelaus is just about the only one who cares that the gods have more or less sent his wife to commit adultery (the other kings are more concerned with keeping the gods on their side). One of the songs explains why a husband returning home early has only himself to blame for finding his wife in bed with another man.

    Video Games 
  • This can be done in The Sims. Getting caught will result in the loss of relationship points with all parties involved.
  • During Earth's final moments in One Chance, you can have sex with one of your co-workers at work, even though you are married. However, go home and you'll find out that your wife has committed suicide. (due to the world ending, as she remains ignorant of your infidelity.)
  • You can accidentally (or not) do this in Dragon Age: Origins. Picking any of the more flirtatious dialogue options with a potential Love Interest will make them think you're in a relationship. If you're already involved with someone, you'll eventually be forced to choose; losing approval with the one you give up.
    • If a female PC woos Alistair and later arranges for him to marry Anora, they can stay together. Alternatively, if a female human noble marries Alistair, but romanced Zevran, the same situation can happen in reverse. In both cases, it's an affair out of a political marriage, rather than a romantic relationship, which has different implications.
    • As a male Warden, you can exploit a glitch that allows you to be in a relationship with both Morrigan and Leliana, even after you're supposed to have chosen only one of them.
  • Eternal Darkness: Chandra volunteered her eternal love to Karim if he could get his hands on a certain treasure. This one ends tragically for both of them. For Chandra, she fell in love with another guy, hence the trope, only to infuriate his beloved and get herself killed. She makes it to Karim in time to convince him not to pick up the artifact, and instead to guard it for however long it takes. She confesses the error of her ways, and he lets loose upon her as soon as he learns the truth before volunteering his services in guardianship to the artifact. "The things I do for love..."
  • In Metal Gear Solid, Meryl's mother cheated with her husband's brother, Colonel Campbell, resulting in Meryl.
  • You can do this in Mass Effect 2, if you romanced someone in both games. There are ramifications for being unfaithful in the third game, though the nature and severity of the consequences depends on the characters involved. Ashley takes Shepard cheating on her with Tali very well, for instance, and both Ashley and Kaidan essentially declared any romance with Shepard over on Horizon in the second game, so Shepard wasn't being unfaithful. During the Lair of the Shadow Broker DLC Liara eventually gets over it if you wound up with someone else, but she's clearly still upset about it if you were with her in the first game. And since the romances started in ME2 were consummated right before a suicide mission, if the player chooses to end things in the third game, it's understood.
    • Jacob Taylor ends up in a relationship with Dr Brynn Cole (and has a child with her) even if you romanced him as a female Shepard.
  • In Grand Theft Auto IV, Mallorie Bardas cheats on her boyfriend, Roman, with Vlad Glebov. Roman is OK with it, but his cousin, Niko, is not, and kills Vlad.
    • Roman himself states sleeping with different women during the course of their relationship. While he eventually stops cheating on Mallorie, his favourite activity is still visiting strip clubs.
  • This is Battler's reason for disowning his father Rudolf in Umineko: When They Cry: almost immediately after Asumu's death, Rudolf engaged himself to his business partner Kyrie, who was already pregnant with their daughter Ange. And then it turns out that Battler is actually Kyrie's son, having been Switched at Birth with the child of Asumu, the woman he thought was his mother, after her child was stillborn, and Rudolf did this to cover up the affair he had with Kyrie without either woman knowing.
  • This is what kick-starts the plot of Catherine. Vincent is engaged to Katherine, then wakes up in bed with the titular character...
  • This happens in every route except Phorni's in Symphonic Rain
  • Persona 3 requires you to max out various "social links" to get the best ending. Unfortunately, all of the social links with girls your age (or with most of the guys if you pick the female protagonist in the PSP remake) involve dating them and imply sleeping with them when you max them out. This trope is played straight in that the girls will get jealous if you date multiple girls at once, but is subverted in the end because once you reach the ending of a social link, you're free to go after another girl with no threat of breaking the link.
    • There's also a great scene added to Persona 3: FES where all the girls you are dating at school almost figure out what's going on and almost corner him while setting up for the school festival.
    • The female protagonist can actually get two party members to bicker over her in combat if she maxes out social links with them. Oddly enough, she has an easier time cheating because she doesn't have to worry about reversed S.Links from running around like the male character does despite no one ever mentioning it outside of the above mentioned bonus scene from FES.
  • Persona 4 uses the same social link mechanic, but you're given the option of keeping your friendships with the girls platonic and pursuing only one or no girls. However, you also have the option of sleeping with them all if you do it right. In the remake, however, you'll be forced to reject all but one of the girls on Valentine's Day if you're lovers with more than one of them, in a continuous series of heartrending scenes that are all fully voice-acted.
    • A major element in the game's story is the news that council secretary Taro Namatame had been having an affair with reporter Mayumi Yamano. When she is found dead, suspicion is thrown on Namatame and his wife, Enka singer Misuzu Hiiragi, but both apparently have solid alibis. And neither did it anyway.
    • In the Devil Social Link, Sayoko Uehara, a nurse and the focus of the link, flirts with the protagonist throughout, and even teases him if you admit that you have a girlfriend. It later turns out that she had to leave her last job because she got involved with a married doctor, and when the doctor cheats on her again, the wife tracks Sayoko down, cusses her out and scratches her, even though the doctor was with a different nurse.
  • Persona 5 uses its own social link mechanic like the above, up to and including platonic and romantic relations with the girls of the cast. Unlike the other games, however, trying to romance multiple girls at once ends with all of them tearing you asunder on Valentine's Day while Sojiro (who's the adoptive father of Futaba, a party member and romance option) passes the popcorn.
  • The game In the 1st Degree has this happen. To start, you have Zachery Barnes and his wife Yvonne Barnes, as well as James Tobin and his girlfriend Ruby Garcia. Yvonne has been very focused on her career, leaving Zach unhappy. Tobin has slept around, and even told Ruby that he is only interested in getting into her pants, leaving Ruby unhappy. As a result, Zach and Ruby had an affair. There were reprecussions from this. First, Zach wrote a love letter to Ruby admitting that he loves her, but he is convinced that the affair should not have happened. Second, Tobin found out about the affair and was furious over it, giving him one more reason to murder Zach. Third, Yvonne found out about the affair, and brought the gun from Zach's cousin Daryl Barnes to the art gallery to threaten her husband. Yvonne and Zach did have a long talk and may have planned to give their marriage a second chance. Yvonne did tell Zach about the gun, but he laughed and decided to have it locked in his desk until he can return it to his cousin. Now that is drama!
  • In L.A. Noire there's a few cheating couples in the various missions but more prominently is Cole's affair with Elsa which Roy outs, splashes around the newspapers and causes Cole to get demoted from Vice back to Arson. Adultery was illegal in 1947, when the game was set.
  • In Culpa Innata, the citizens of the World Union are encouraged to avoid romantic attachments. Marriage (or rather "nuptial agreements") are not permissible for Union citizens. They are, however, allowed to have primary sexual partners, which means absolutely nothing from a legal (or personal) standpoint. During the game, one of the potential Union citizens is an Indian immigrant, who reveals that he has cheated on his wife on several occasions and doesn't feel guilty about it (he's also a sociopath), while his wife never did because of the social Double Standard in Indian culture.
  • You almost get away with this in Rune Factory Frontier by asking another girl on a date and then proposing to her with the wedding bouquet, which is the item required for marriage of any girl not playing a part in the storyline, and can be synthed multiple times. Presenting the bouquet when prompted will lead to a short scene where the dated girl calls you out on it, and while this happens your wife approaches and catches you red handed. After two emotional lines depending on the wife she then proceeds to (understandably) beat the everloving shit out of you while the now SHAKING camera pans to show Whale Island, during which the gloriously deadpan line "[Wife's name] is angry." appears on the screen accompanied by a "Don't try this at home" seconds later. Raguna's cries of pain illustrate as audio during the whole thing, and then the camera cuts back to your date vanished and you collapsed on the floor. She leaves you with exactly 1 HP and 0 RP, and her Love and Friendship gauges are reset to zero. Even more jarring if you married someone pacifistic, like Tabatha or Lara. But your wife only minds if you propose. It's fine if you go out with a different girl every month so long as you don't offer them a wedding bouquet.
  • In Pretentious Game 3, the gray square is a womanizer who cheats on his wife, the light pink square, with the bright pink square. The light pink square divorces her husband when she discovers the affair.
  • This is a possible outcome in Firewatch, depending on your choices.
  • Most Harvest Moon games allow you to flirt with other women and men without much issue besides maybe your spouses affectionate going down. In Harvest Moon A Wondeful Life if you get all or a bachelorettes Heart Events then marry someone else, the next chapter she will come to your house and rant you out. The same can occur in the Distaff Counterpart Harvest Moon Another Wonderful Life with the bachelors.

    Visual Novels 
  • This is how you get bad endings for all four of the girls from Eroge! Sex And Games Make Sexy Games in their routes; by giving into temptation from other women while in a relationship with either Iori, Momoka, Kisara, or Nene.
  • In Katawa Shoujo, you can have a sex scene with Misha, but not only is Hisao already going out with her best friend Shizune (the person Misha is actually in love with) by this point, this whole thing leads to a bad end, where Shizune never finds out... but breaks up with Hisao because she blames herself for pushing Misha and Hisao away.
  • In Our Personal Space, if your relationship with your husband is low enough, you can have a passionate love affair with your job assistant.
  • Voltage Inc's In Your Arms Tonight is pretty much Your Cheating Heart: The Visual Novel. The story is kicked off by the protagonist discovering that her new husband of three months is cheating on her with another woman; although she can choose to summarily divorce him, in several of the game's possible routes she attempts to stick it out and make their marriage work only to fall in love with another man.
    • In the route focusing on the protagonist's husband, Koichi, it's eventually revealed that his mistress is also married to his boss, and that his father has a long-standing relationship with another woman which Koichi's mother knows about and refuses to acknowledge, a fact which goes towards explaining Koichi's skewed perspective on his own marriage.
  • True Love Junai Monogatari:
    • The player can technically sorta do this a la Persona 4: the Player Character can romance (and bed!) almost all the prospect bachelorettes in the game if the player plays their cardss right. And then it's subverted - the PC can flirt/sleep with all the girls, but only ask one of them out.
    • If the Player Character is seeing both Mikae and Remi, he'll get the chance to date Remi on the 27th of September and Mikae on the 28th. If it happens, Mikae will believe he had sex with Remi (even if he didn't), she'll call him a bastard and leave in a huff, ruining the chances with her forever. Not only it's the only time the player gets directly punished for pursuing more than one girl, but properly romancing Mikae will explain why does she explode like that on the PC: she had liked the guy for years already and was getting ready to give him her own Love Confession, but the deal with Remi convinced her that he was stringing her along all the time.

    Web Comics 
  • The issue of just what constitutes cheating was raised in Friendly Hostility. Fox is devoted to his boyfriend, Collin, but his bisexual colleague Derringer springs a kiss on him, just to see what it's like. Fox is outraged. However, he's even more outraged when Derringer questions Fox's kissing skills... and so Fox kisses him again to prove his aptitude. On the Friendly Hostility blog (doubling as The Rant), fans varied between "kissing is cheating" to "it was just a kiss" to "kissing usually counts, but there was no affection behind it, so it doesn't." Some fans even suggested that it might be good for Fox and Collin to break up following this incident, since they didn't think it was psychologically healthy for Collin to only have one romantic/sexual partner in his lifetime and he needed to "see other people" rather than remain exclusive to Fox.
  • Nerf NOW!! had Sniper-tan cheating on Pyro with the Spy, after an argument. Spy later produced ambiguous evidence that Pyro had had an affair with Engie-tan. Subverted in that nether of them were caught... at least by each other.
  • Eva apparently cheated on Davan of Something*Positive several times while they were together, before he finally caught her doing it with her abusive ex-boyfriend.
    • Kyle also cheated on PeeJee numerous times - this proved to be a really bad idea when she found out.
  • Homestuck:
    • Zigzagged. Dave and Terezi were in a relationship, but he found out she was also seeing Gamzee. However by troll standards Terezi did nothing wrong, since her relationship with Dave was redrom (romantic) while her relationship with Gamzee was blackrom (Foe Yay) which trolls consider two vital and distinct types of relationships. Dave however still broke it off since by human standards she was cheating and she had tried to hide it from him.
    • Played straight, however, with Rufioh, who is stated fairly explicitly to have cheated on Damara with Horuss. Suffice to say it doesn't end well for any of them.
  • Eerie Cuties: This applies to Layla's ex-boyfriend, Kade Whiteclaw, which is lampshaded by the Hellrunes, here, after he's caught in the act of cheating on Layla. A few strips later, Layla also points it out, right before decking him.
  • In Distortion Nuzlocke, Johnny catches Mr. Fangen cheating with his wife on Erika.
  • NJ from Electric Wonderland had a girlfriend, Suē, who cheated on him with 27 guys. After she flirted with NJ's closest male friend, Torro, he told NJ about it, setting off a chain of unpleasant revelations that resulted in NJ breaking up with Suē. His public revelation of her affairs subsequently land everyone in a conflict of Gamergate proportions.
  • Jerry from Contest Jitters cheats on his bodybuilding girlfriend when he finds a more conventional beauty.
  • In El Goonish Shive, this plays a big role in Susan's backstory. Susan's father cheated on her mother, and Susan discovered this by walking in her father with the other woman. This event left Susan a bit distrustful of men for a while. It also led to her dyeing her hair, as her natural blonde hair reminded her of her father's mistress.
  • You can trigger a bad ending in Violet if you use a command to have sex with, kiss, or simply hug your ex 6Julia.
    *** I hope you get a disease ***
  • A frequent topic of Saturday Morning Breakfast Cereal.

    Web Original 
  • Parodied by CollegeHumor in "Breaking Dawn Cheating Outtakes", which satirizes the publicized affair Kristen Stewart had with one of her directors, and Robert Pattinson's expected reaction to this.
  • Where the Bears Are: Wood, Wood, Wood. He has a sexual relationship with Detective Winters, and then gets into one with Detective Martinez. He's not exclusive with either, but he still tries to keep each cop from finding out about the other. It turns out that the detectives are married, and in fact neither knows that the other is banging Wood.
  • At the beginning of Vox And King Beau, Beau helps Vox discover that her boyfriend is cheating on her.
  • The Jenkinsverse: Ava Rios, who cheats on her high-school beau Adam after years of long-distance relationship.
  • In Super Mario Logan's "Toad's Girlfriend!", this is all over the place and all Played for Laughs.

    Western Animation 
  • One episode of American Dad! has Francine reveal that she cheated on Stan the day before they got married, which may or may not have led to Hayley.
  • On As Told by Ginger, Darren cheats on Ginger with a cheerleader named Simone at one point during high school, which creates a massive rift in their relationship for some time.
  • Happens in Batman Beyond when Melanie/Ten returns to town and sneaks into Terry's room. Terry gets a phone call from his steady girlfriend Dana and blows her off to have a make out session with Melanie.
  • Bob's Burgers:
    • An episode focused on Mr. Fischoeder trying to win back an ex-girlfriend who is obsessed with dating married men, so he asks Linda and the kids to pretend to be his family so she'll have more of a desire to get back together with him. Linda flat out calls her a homewrecker, and later when the facade is revealed, the woman states she respects herself too much not to be the other woman.
    • Another episode features a flying instructor who seduces bored housewives by staging fake crash landings on an isolated islands. When he tries it on Linda, she barely notices until he basically throws himself at her, at which point she shuts him down flat.
  • Daria:
    • Daria and Tom kiss while Tom is dating Daria's best friend Jane.
    • It's implied that both Brittany and Kevin have cheated on each other at various times, though this is Played for Laughs.
  • Family Guy:
    • One episode has Lois sleeping with Bill Clinton and she claims that he was so influential that she couldn't control herself. Lois apologizes to Peter for her affair and wants him to cheat on her in order to make things even. Peter tries to go through with the plan, but ultimately backs out and says he can look past Lois cheating and that the two of them can work out their problems. He then goes off to confront Mr. Clinton... and winds up sleeping with him.
    • Lois cheats on Peter again in the episode "Into Harmony's Way", which is Played for Laughs and she gets away with it.
    • Played in the episode "Call Girl" where Peter cheats Lois with a phone sex girl who actually is Lois herself. She dresses herself up and meets Peter at the Quahog Motel where he opens up and tells her she is beautiful, which almost makes Lois happy until he goes ahead and has sex with her, still unaware that she is Lois. Eight hours later, Peter finds out the truth and Lois is angry, but Peter admits that he somehow felt they were true soulmates and really did love her.
    • Loretta cheats on Cleveland with Quagmire due to being unhappy with how Cleveland has no passion in his life or his relationship with her. Cleveland being too passive is the episode's plot point and his friends try to Teach Him Anger to get the fire back his soul and to have him kick Quagmire's ass for sleeping with Loretta. Cleveland does get angry, but is unable to attack his best friend and decides to divorce Loretta instead.
    • Both Lois and Peter's mothers have cheated on their husbands. With Lois's mom, it was with Jackie Gleason and her brother catching them in the act led him to be become a Serial Killer of fat men. With Peter's mom, it was with a drunk Irishman and resulted in her being pregnant with Peter.
  • In Kick Buttowski Kendall is technically cheating on Ronaldo with Kick, with her multiple moments of flirting with and kissing him while still officially dating Ronaldo. It's mostly not portrayed as a bad thing, however, since earlier episodes established that it's Kick she's always had her eye on.
  • King of the Hill:
    • Nancy cheated on her husband Dale for years with John Redcorn. Despite being a paranoid conspiracy nut, Dale never even figured out that their clearly Native American son wasn't his (though he does believe he was conceived by alien in-vitro, since he wasn't even home around the time of conception). The twist is that everyone else knows about the affair. They all just don't tell Dale because they want to spare his feelings and they know Nancy still loves Dale despite her cheating.
    • Buck Strickland cheats on his wife. Quite a lot, in fact. In fact, so does his wife, as evidenced in an episode where she tried to come on to Hank. However, this is something of a subversion in that she attempts to cheat on Buck with Hank. This comes from the fact that Mrs. Strickland was tired of all the years her husband treated her like crap by cheating on her, and decided to get even by having her own affair. Hank rebuffed her, however.
  • Jem is terribly confusing about this. The IDW reboot removed all the infidelity, much to many fans relief:
    • Rio and Jerrica have been a couple since high school, and Jerrica liked him even prior. When Jerrica makes an alter ego in "Jem" she still hits on her boyfriend despite the fact she won't reveal Jem is Jerrica. Rio is weirded out at first but gives in to Jem's advances eventually. This causes a weird dilemma where Rio is cheating on Jerrica with herself and there's a confusing love triangle going along, especially since to an outsider it looks like Jem is cheating with her manager's boyfriend. In a third season episode Jerrica believes Rio is cheating on her with a woman nicknamed Minx so she creates a third persona and flirts with Rio to see if he would cheat. We're supposed to be under the impression that Rio subconsciously likes Jem because she is really Jerrica but instead Jerrica comes off as toying with Rio's head and having identity issues. There were some plans to have Rio be shown to have known all along but that was scrapped because it would cause many Series Continuity Errors.
    • To make everything weirder in season 3 Riot is introduced and loves Jem but not Jerrica. Jem sometimes flirts with Riot but overall seems to prefer Rio.
    • Jerrica's biological sister Kimber isn't much better. She has several casual love interests but doesn't make it clear who she is dating and when they break up. This bombs in her face when two of her boyfriends learn about each other and fight for her love. They both end up wanting to marry her.
    • Aja mistakes her boyfriend, Craig, for cheating on her with her rival Stormer however it turns out they're just siblings.
  • Shayera and John Stewart are shown to have a powerful romance in Justice League… until it was revealed that Shayera was already engaged to a warrior from her home world.
    • Justice League Unlimited continues the issue by showing their spiritual predecessors during Egyptian times had a similar extramarital affair.
  • In Legend Of Korra Mako returns Korra's Forceful Kiss/"Shut Up" Kiss despite being in a relationship with Asami. While he doesn't go out of the way to be an asshole, he still commits the huge mistake of hiding it all from Asami, and she only learns about it through Bolin; understandably, Asami is not too happy about it.
    • Mako does this again in book 2 where after he breaks up with Korra, he gets back together with Asami. Korra then loses her memories of the last few days and doesn't remember that they broke up. Mako doesn't tell her they broke up immediately, getting a big What the Hell, Hero? from the entire cast.
      • In the end Mako ends up breaking up with Korra for good and does not rekindle his relationship with Asami. And at the end of the series Korra and Asami end up becoming the Official Couple of the series and Mako is the only member of Team Avatar to not have a love interest.
  • Moral Orel:
    • Principal Fakey is cheating on his wife with Nurse Bendy (who's fairly indifferent to the whole affair). He feels guilty about it (and Reverend Putty shows off more jealousy than advice), so Orel tells him that as an authority figure he can do no wrong . . . so he continues the affair guilt-free in denial. This does NOT end well.
    • Another example more relevant to the plot: Bloberta cheated on Clay with Daniel Stopframe, which resulted in Shapey. And of course in the present, Clay seems to have something going on with Stopframe. Who he then cheats on with Ms. Censordoll.
  • Invoked in-universe in Pepper Ann with Gwen Mezzro stating she now finds herself strangely attracted to Milo now that he's supposedly dating Pepper Ann. When she asks what that makes her, Nicki bluntly calls her a homewrecker.
  • A really messed up example occurs in the Ren and Stimpy episode, Ren's Brain. Ren, who was at the time a disembodied brain and unaware of it, comes home from work to find Stimpy sitting with Ren's body. Cue Ren's brain having a Freak Out, accusing Stimpy of " Entertaining another chihuahua", calling his body a "homewrecker", all culminating in the viewers' heads exploding, then the Earth itself explodes and Ren's brain is seen floating off into space yelliing "YOU EEDIOT!".
  • The Simpsons:
    • Apu cheated on his wife Manjula with the Squishee lady, and signs up for "Sassy Madison", a dating website for married people.
    • Averted with Homer and Marge; both have had opportunities and temptations to cheat, but have racked up quite a few Crowning Moments Of Heartwarming by sticking together.
    • One episode reveals that Mona was cheating on Abe around the time of Homer's conception, leading to questions about whether or not he was the father. It turns out he really is. Additionally, Homer's half-brother Herb Powell is the product of an affair between Abe and a woman who worked at a carnival. And still: there is Edwina, the woman Abe met in England during WWII, who bore him Abbie, basically a Distaff Counterpart to Homer.
  • South Park:
    • Butters' dad cheated on his mom with numerous gay men, leading her to go crazy and plan to kill herself and Butters.
    • Cartman was conceived from an affair between his mother and Jack Tenorman, Scott Tenorman's father. Also implied between her and Kyle's dad Gerald, another potential father, though in another episode he's apparently fine with his wife sleeping with Chef, implying they may have an open marriage.
  • On Total Drama World Tour, Duncan cheats on Courtney by kissing their mutual friend Gwen, leading to much drama during the rest of the season, as not only is Sierra angry at Gwen, but also Cody is also angry at Duncan.

Alternative Title(s): Adultery