History Main / LoveInterestTraitor

** Played with for Morrigan if you romance her from ''VideoGame/DragonAgeOrigins''. At the start of the game, her mysterious witch hermit mother saves the PlayerCharacter and their NumberTwo Alistair from certain death, and both assure you they have no ulterior motive besides wanting to aid you in saving the world from the [[WorldWreckingWave Blight]], despite them both exuding DarkIsEvil vibes. If the male protagonist pursues a relationship with Morrigan, she's convinced LoveIsAWeakness, struggles with WhatIsThisFeeling, and practically begs you to break up. Towards the end of the game, she reveals [[spoiler:she and her mother always planned to convince you (or one of your male Grey Warden companions) to impregnate her in a mysterious dark magic ritual that will lead to her fetus being possessed by the soul of an Old God, after which she'll leave to raise the child Maker knows where for Maker knows what reason.]] The player can accuse her of betrayal, though she argues that [[ExactWords she was always upfront about wanting to aid you till the Blight was over, and she has done just that]]. For the ''Witch Hunt'' DLC, [[spoiler:the protagonist may agree with her, or stab her for it.]]

*** Averted for the Iron Bull should you romance him, since he tells you straight up when you first meet that he's a spy for the [[ScaryDogmaticAliens Qunari]] and will be sending reports back to them (and them to you) as-needed. Subverted in the ''Trespasser'' DLC if [[spoiler:you had Iron Bull reaffirm his loyalty to the Qunari in his personal quest. The Qunari reveal they were always planning on betraying you and had sent him as a [[JustForPun sleeper agent]]. If you convinced him to stay loyal to the Qun, then when his commanding officer orders him to kill you he coldly tells you "[[BlatantLies Nothing]] [[ItsPersonal Personal]], ''[[ItIsDehumanizing Bas]]''[[note]]Qunlat for "thing"[[/note]]", forcing you to kill him. To be fair, you have sacrificed his TrueCompanions which is implied to be his rock when he was KickedUpstairs by the Qun in order to secure the alliance so one could say that the player deserved Bull's reprisal. If you had convinced him to leave the Qunari and save his men instead, then he basically tells his former commanding officer to shove it when she orders him to kill you.]]

-->-- ''WebVideo/{{Badman}}'', "[[https://www.youtube.com/watch?v=enOHraf3LEk&list=PLAEB286C039A1A25E&index=9&t=0s Batman Can’t Stop Thinking About Sex]]"

* Saruhiko and Misaki's backstory in ''Anime/{{K}}'', as shown in the prequel novel ''Lost Small World''. [[spoiler: Subverted in that they do become friends again, and [[HoYay probably more]], once Misaki realizes that Saruhiko really just belongs in the Blue Clan, not the Red - Misaki's myopic loyalty to the Red King made him think Saruhiko was just a power-hungry JerkAss, and [[JerkassWoobie Saruhiko]] [[ThenLetMeBeEvil went with it]] until the end of the second season. It doesn't help that Saruhiko has a lot of issues left over from his AbusiveDad that others took advantage of to split Saruhiko away from the Red Clan and PoorCommunicationKills as a result. It takes until the second season for Saruhiko and Misaki to both be in the position to make up.]] Another same-sex example.

* A twist on this in ''ComicBook/{{Wolverines}}'': Lady Deathstrike starts a relationship with Shogun, who is one body shared by the personalities of Sharp and Ogun. [[spoiler: The Ogun personality is actually a former lover, and Deathstrike is playing the Sharp side for an opportunity to betray and "kill" him, so Ogun can fully take control of their body]].

* Something similar to this trope happened in [[Film/HarryPotter the film version of]] ''Literature/HarryPotterAndTheOrderOfThePhoenix'', resulting from the adaptation combining the characters Cho Chang and Marietta Edgecombe. In the movie, it's implied poor Cho was under a TruthSerum, but that doesn't stop Harry from dumping her (in the novel, ''she'' dumps ''him'' over realising that they simply didn't work out, since [[spoiler: Cho was still ''massively'' hurting over the death of her boyfriend Cedric, murdered by Voldemort in front of Harry]]).

* In ''Literature/DragonBones'', there is some flirting between [[spoiler: Bastilla and Ward]], and the woman turns out to be a traitor. It doesn't develop into an actual relationship before it becomes clear who is with the villains, though.

%%* ''Series/AgentsOfSHIELD'': "Turn, Turn, Turn" reveals that [[spoiler: Ward was one for Skye]].

* Played with in ''VideoGame/FireEmblemAwakening'': [[spoiler: The Avatar ''can'' be one of Prince Chrom's love interests if female, and has massive HoYay with Chrom if male... but the part where s/he kills Chrom and thus kicks off the BadFuture happens whether the Avatar is a male or a female ''and'' whether a girl Avatar is married to Chrom or not.]] Also, [[spoiler: s/he doesn't do it ''willingly'' but only when his/her body is taken over by the EvilGod Grima, whom s/he is supposed to be the vessel of... and the plot of the game as a whole is about ''preventing'' the BadFuture (and thus the Avatar's betrayal) from taking place]].

** In ''Manga/ResidentEvilTheMarhawaDesire'', [[spoiler: Bindi Bergara]] is teased as a LoveInterest to protagonist Ricky. Turns out, she's actually a BitchInSheepsClothing and the behind the events plaguing the Academy.
* [[spoiler: Penelope]] of the ''VideoGame/SlyCooper'' games. [[spoiler: She betrays Bentley]] due to his devotion to his friends over her, and becomes a major antagonist in [[VideoGame/SlyCooperThievesInTime the fourth game]].
* In ''VideoGame/TalesOfXillia'', [[spoiler: Alvin]] was this to [[spoiler: Presa]] in the past. A rare case where the traitor is on ''your'' side [[ChronicBackstabbingDisorder (well, at least half the time)]] and the one betrayed is a villain. [[spoiler: (Though she's actually a Type IV AntiVillain) It's implied she genuinely loved him, but... a complicated string of betrayals got in the way]].

* In ''VisualNovel/NineHoursNinePersonsNineDoors'' [[spoiler:June/Akane]] is this to [[spoiler: decoy protagonist Junpei]] when [[spoiler: she turns out to be the big bad Zero, who kidnapped him and 8 other people and put them in a deadly game.]] Unlike most examples [[spoiler:her]] affection is genuine (as confirmed by WordOfGod) and the betrayal is more of a case of IDidWhatIHadToDo [[spoiler: since the game was actually designed to save her life in the past]]; when all is said and done, the victim of the betrayal doesn't hold a grudge, and the two get together for real at the end of ''VisualNovel/ZeroTimeDilemma'' (where [[spoiler:she]] no longer qualifies as this trope).

* In ''VisualNovel/{{Tsukihime}}'', [[spoiler:Kohaku]] has this role on their route. The two [[spoiler: stay together afterward]].

** In addition to being a SixthRangerTraitor, the series's version of Terra was this to Beast Boy. It was implied that (unlike the original Terra), she ''did'' like Beast Boy back, trying to save him from the rest of the Titans' fate, but not enough to choose him over Slade. [[spoiler: She ultimately rebelled against Slade when Beast Boy confronted her upon her deeds, and then performed a HeroicSacrifice to save the whole city as well as the Titans themselves.]]

* The story of Literature/{{Samson and Delilah}} in Literature/TheBible. Samson, an Israelite who had great strength because of his unshorn hair (a symbol of a vow to God), was betrayed by his lover Delilah, who had a man sent by the Philistines shave his head and handed him over to the Philistines who blinded him and made him a slave.

[[quoteright:350:[[Film/SamsonAndDelilah https://static.tvtropes.org/pmwiki/pub/images/rsz_1f6dfa7f_4b3a_4160_a372_0fccfed9aef9.png]]]]

* The story of Samson and Delilah in Literature/TheBible. Samson, an Israelite who had great strength because of his unshorn hair (a symbol of a vow to God), was betrayed by his lover Delilah, who had a man sent by the Philistines shave his head and handed him over to the Philistines who blinded him and made him a slave.

* ''Film/SkyHigh2005'' features a generally dorky NiceGuy named Will going out with an older girl named Gwen, whose role is basically [[SempaiKohai showing him the ropes of superhero school in between being sweet on him]]. Turns out she just wanted the weaponized FountainOfYouth in his basement...

* In ComicBook/TheJudasContract arc of ComicBook/TeenTitans Terra is set as this to Beast Boy. Noticeable in that this original Terra was far, ''far'' nastier than the cartoon one: while cartoon!Terra was a sort of DarkMagicalGirl, comics!Terra was a ManipulativeBitch and so psychotic that ''[[ComicBook/{{Deathstroke}} Slade]]'' was afraid of her.

* On ''Series/{{The 100}}'', Lexa kisses Clarke and asks her to come away with her to the Grounder capital, but soon afterwards betrays Clarke to Mount Weather. Unlike most examples of this trope, Lexa had no intention of betraying Clarke when she made those romantic overtures; she just felt that the deal Mount Weather offered her was more important than her personal feelings towards Clarke.

* ''Series/{{Homecoming}}'': In 2022, as she’s trying to make sense of her missing memories from Homecoming, Heidi kindles a brief romance with “Hunter”, a divorced veteran who’s willing to listen to her problems; he even drives her back to Tampa when she decides to return to the Homecoming facility to investigate. It’s actually her [[CorruptCorporateExecutive old boss, Colin,]] trying to find out what she knows and steer her away from remembering the truth about Homecoming - she just [[AmnesiacHero doesn’t remember who he is.]]

* ''WesternAnimation/TeenTitans2003''

*** Averted for the Iron Bull should you romance him, since he tells you straight up when you first meet that he's a spy for the [[ScaryDogmaticAliens Qunari]] and will be sending reports back to them (and them to you) as-needed. Subverted in the ''Trespasser'' DLC if [[spoiler:you had Iron Bull reaffirm his loyalty to the Qunari in his personal quest. The Qunari reveal they were always planning on betraying you and had sent him as a [[JustForPun sleeper agent]]. If you convinced him to stay loyal to the Qun, then when his commanding officer orders him to kill you he coldly tells you "NothingPersonal, ''[[ItIsDehumanizing Bas]]''[[note]]Qunlat for "thing"[[/note]]", forcing you to kill him. To be fair, you have sacrificed his TrueCompanions which is implied to be his rock when he was KickedUpstairs by the Qun in order to secure the alliance so one could say that the player deserved Bull's reprisal. If you had convinced him to leave the Qunari and save his men instead, then he basically tells his former commanding officer to shove it when she orders him to kill you.]]

*** Averted for the Iron Bull should you romance him, since he tells you straight up when you first meet that he's a spy for the [[ScaryDogmaticAliens Qunari]] and will be sending reports back to them (and them to you) as-needed. Subverted in the ''Trespasser'' DLC if [[spoiler:you had Iron Bull reaffirm his loyalty to the Qunari in his personal quest. The Qunari reveal they were always planning on betraying you and had sent him as a [[JustForPun sleeper agent]]. If you convinced him to stay loyal to the Qun, then when his commanding officer orders him to kill you he coldly tells you "NothingPersonal, ''[[ItIsDehumanizing Bas]]''[[note]]Qunlat for "thing"[[/note]]", forcing you to kill him. If you had convinced him to leave the Qunari, then he basically tells his former commanding officer to shove it when she orders him to kill you]].

** Finally, in ''[[WesternAnimation/ScoobyDooAndTheAlienInvaders Alien Invaders]]'', Shaggy's girlfriend Crystal isn't a traitor, exactly, but she is connected to the film's haunting; she's an alien. A real one. She and Shaggy part on amicable enough terms, but she ultimately has to go back to her home planet (insert ''[[WesternAnimation/TheSimpsons Simpsons]]'' reference here).

* Jezebel Jet dated Bruce Wayne while trying to break him on behalf of the Black Glove in ''[[ComicBook/GrantMorrisonsBatman Batman RIP]]''.

* A twist on this in ''Comicbook/{{Wolverines}}'': Lady Deathstrike starts a relationship with Shogun, who is one body shared by the personalities of Sharp and Ogun. [[spoiler: The Ogun personality is actually a former lover, and Deathstrike is playing the Sharp side for an opportunity to betray and "kill" him, so Ogun can fully take control of their body]].

* Played with in ''VisualNovel/FullMetalDaemonMuramasa''. [[spoiler:Chachamaru Ashikaga is first introduced as one of the generals for the ruthless Rokuhara Shogunate but is also presented as the TokenGoodTeammate of the bunch, being the most easygoing of them and routinely helping the heroes with her increasingly being set up as one of the potential love interests for the main lead Kageaki. Turns out she is manipulating just about everyone in favor of her own agenda and even resorts to brainwashing Kageaki when she gets the chance. While her love for the him is genuine, her methods and goals means that they ultimately can't see eye to eye]].

[[folder:Web Comics]]

* [[HotScientist Megan Reed]] plays with this trope in the ''Franchise/DeusEx'' prequel games. In ''VideoGame/DeusExHumanRevolution'' she is the protagonist Adam Jensen’s ex and is kidnapped in the beginning of the game. Adam spends almost the entire game trying to find her, only to find her being treated rather comfortably in an Illuminati facility. Adam can also discover evidence that she might’ve gotten close to him, only for the purpose of [[DoubleEntendre obtaining a genetic sample]]. And the post-credits stinger shows Megan conversing with Bob Page, the BigBad of the original ''VideoGame/DeusEx''. And in ''VideoGame/DeusExMankindDivided'', Adam can find a data pad in a Versa-Life[[note]]BobPage’s biotech company[[/note]] vault, stating that Megan is continuing to use his DNA to build superior bonding processes for mechanical augmentations, but the process can also be used as a particularly nasty bioweapon against augmented people. It is an AmbiguousSituation whether she is being used, or is in on Bob Page’s schemes.

** Sam's (demonic) love interest across two seasons, Ruby, who'd claimed to be on the Winchesters' side as an EnemyMine against the demons in charge, turns out to have been manipulating Sam into freeing Lucifer and starting the apocalypse all along. She clearly thinks she's been ''helping'' [[PoisonousFriend him discover his true nature despite himself]], but Sam is enraged and horrified and kills her as she relishes the moment of succeeding in her deep-cover mission and boasts of her unmatched loyalty to Lucifer.

* ''Series/RingsOfPower'': Galadriel and Halbrand form an unlikely friendship, with her encouraging him to seek power and fulfill his destiny and him counseling her to be more manipulative and savvy in her dealings with humans. Although nothing physical happens, there's copious ShipTease and when he finally reveals himself to be her sworn enemy and the embodiment of evil, Sauron, he proposes they rule as King and Queen of Middle Earth.

%%* Igor is this to Alyona on Series/NineteenFortyOne, ''Series/NineteenFortyOne''.

* [[HotScientist Megan Reed]] plays with this trope in the ''Franchise/DeusEx'' prequel games. In ''VideoGame/DeusExHumanRevolution'' she is the protagonist Adam Jensen’s ex and is kidnapped in the beginning of the game. Adam spends almost the entire game trying to find her, only to find her being treated rather comfortably in an Illuminati facility. Adam can also discover evidence that she might’ve gotten close to him, only for the purpose of [[DoubleEntendre obtaining a genetic sample]]. And the post-credits stinger shows Megan conversing with Bob Page, the BigBad of the original ''VideoGame/DeusEx''. And in ''VideoGame/DeusExMankindDivided'', Adam can find a data pad in a Versa-Life[[note]]BobPage’s biotech company[[/note]] vault, stating that Megan is continuing to use his DNA to build superior bonding processes for mechanical augmentations, but the process can also be used as a particularly nasty bioweapon against augmented people. It is an AmbiguousSituation whether she is being used, or is in on Bop Page’s schemes.

* Saruhiko and Misaki's backstory in ''Anime/{{K}}'', as shown in the prequel novel ''Lost Small World''. [[spoiler: Subverted in that they do become friends again, and [[HoYay probably more]], once Misaki realizes that Saruhiko really just belongs in the Blue Clan, not the Red - Misaki's myopic loyalty to the Red King made him think Saruhiko was just a power-hungry JerkAss, and [[JerkassWoobie Saruhiko]] [[ThenLetMeBeEvil went with it]] until the end of the second season. It doesn't help that Saruhiko has a lot of issues left over from his [[ParentalAbuse abusive]] [[{{Jerkass}} father]] that others took advantage of to split Saruhiko away from the Red Clan and PoorCommunicationKills as a result. It takes until the second season for Saruhiko and Misaki to both be in the position to make up.]] Another same-sex example.

* ''Anime/OccultAcademy'' has an example in Mikaze, who is set up as a love interest for the hero but ends up being the BigBad.
* [[WhiteHairBlackHeart Kaworu]] [[EnigmaticMinion Nagisa]] in the original ''Anime/NeonGenesisEvangelion'' anime. He arrives at NERV HQ as a new pilot who immediately takes an interest in [[HurtingHero poor, depressed Shinji]] [[HopeSpot when everyone else had either died or become estranged from him]], but turns out to be [[ApocalypseMaiden the final Angel.]] Since he genuinely cares for Shinji despite all of this, Kaworu ultimately goes with the HeelFaceTurn option and performs a HeroicSacrifice to save both Shinji and humanity via allowing Shinji to kill him. Notable for being [[HoYay a same-sex example.]]

* Male example: Yona's beloved Su-won in ''Manga/YonaOfTheDawn''. Although he may have a genuine affection for her, he did kill her father and steal his crown.

* ''ComicBook/{{Runaways}}'': Alex is set up as Nico's love interest, but is ultimately revealed as the team's mole.
* As mentioned below, in ComicBook/TheJudasContract arc of ComicBook/TeenTitans Terra is set as this to Beast Boy. Noticeable in that this original Terra was far, ''far'' nastier than the cartoon one: while cartoon!Terra was a sort of DarkMagicalGirl, comics!Terra was a ManipulativeBitch and so psychotic that ''[[ComicBook/{{Deathstroke}} Slade]]'' was afraid of her.

* A twist on this in ''Comicbook/{{Wolverines}}'': Lady Deathstrike starts a relationship with Shogun, who is one body shared by the personalities of Sharp and Ogun. [[spoiler: The Ogun personality is actually a former lover, and Deathstrike is playing the Sharp side for an opportunity to betray and "kill" him, so Ogun can fully take control of their body.]]

* In ''Fanfic/DanganronpaInHarmonysWake'', Sunset Shimmer and Adagio Dazzle start a relationship together very early in the Killing Game, and stick together for most of it. It is even noted by other passengers that Adagio has slowly become a lot nicer thanks to [[PositiveFriendInfluence Sunset's influence on her]] and the two eventually share a LoveConfession together. In Chapter Five though, Monoponi leaves behind evidence revealing how Sunset was responsible for Adagio and her sisters losing their magic. This causes her to turn against Sunset, breaking off their relationship and eventually trying to kill her, [[spoiler:though her plan is discovered by Trixie, who kills Adagio herself in order to save Sunset]]. This is an interesting example since the whole reason Adagio betrayed Sunset is because she saw Sunset herself as the true traitor to their relationship.

* ''WesternAnimation/{{Hercules}}'': Megara is already working for Hades because of having [[DealWithTheDevil made a deal with him]], so when Hades discovers that Hercules is still around, he uses her as a pawn to get at him. Also a rare example in which [[InLoveWithTheMark she]] ''[[InLoveWithTheMark does]]'' [[InLoveWithTheMark fall in love with him]]; she undergoes a HighHeelFaceTurn and the two end up together.
* A rare example of this being done with a ''male'' character is the Creator/VideoBrinquedo "spectacular" ''What's Up? Balloon to the Rescue'', in which the lead girl is infatuated with suave Frenchman (read: DevilInPlainSight EthnicScrappy) Jean-Pierre.
* [[TheEvilPrince Prince Hans]] from ''WesternAnimation/{{Frozen|2013}}'' is a RareMaleExample. He pretends to fall in LoveAtFirstSight with [[ThePollyanna Princess Anna]], planning to marry her and then arrange an [[MakeItLookLikeAnAccident "accident"]] for her older sister [[TheHighQueen Queen Elsa]], and thereby become the King of Arendelle.

* Something similar to this trope happened in [[Film/HarryPotter the film version of]] ''Literature/HarryPotterAndTheOrderOfThePhoenix'', resulting from the adaptation combining the characters Cho Chang and Marietta Edgecombe. In the movie, it's implied poor Cho was under a TruthSerum, but that doesn't stop Harry from dumping her (in the novel, ''she'' dumps ''him'' over realising that they simply didn't work out, since [[spoiler: Cho was still ''massively'' hurting over the death of her boyfriend Cedric, murdered by Voldemort in front of Harry]]).

* The infamous ''Film/TheGarbagePailKidsMovie'' has the equally-infamous Tangerine (infamous because she looks about ten years older than her early-teens leading guy; the actors are a year apart in real life). Her loyalty turns out to be to a street gang, and the poor girl gets pooped and vomited on at the end of the movie by the title characters for it.
* ''Film/WarriorsOfVirtue'' (also known as "that one with the ninja kangaroos") did this, too, with the girl joining up with the [[HamAndCheese hamalicious]] BigBad to avenge her brother, who had been accidentally killed by a kangaroo ninja. She's ultimately killed by her boss when she has a change of heart and helps the hero escape.

* Elsa from ''Film/IndianaJonesAndTheLastCrusade''. To be fair, she genuinely loved Indy (and...uh...Indy's ''dad'' too, apparently), but she's single-mindedly obsessed with getting her hands on the Holy Grail to the point of working with Nazis.
* In the 1966 ''Film/BatmanTheMovie'', Bruce falls in love with Kitka only to find out she's Catwoman (and definitely a villain in this incarnation).
* ''Film/TheDarkKnightRises'' have Bruce romance his business associate Miranda Tate, who is later revealed to be Talia al'Ghul, and also the BigBad of the movie.
* Peggy Brandt in ''Film/TheMask'', as part of the BettyAndVeronicaSwitch.
* ''Film/{{Phoenix|2014}}'': Nelly survives a concentration camp and yearns to be with her husband Johnny again. However, Johnny doesn't recognize her and instead hires her to impersonate the wife he believes is dead so he can collect her inheritance. That gives a pretty good hint that Johnny is really a scumbag, but Nelly goes along with it out of love anyway, hoping he'll recognize her eventually. In the end, Nelly learns that Johnny was the one who sold her to the Nazis and had her put in the concentration camp, and that's when she decides to leave him.
* In ''Film/NorthByNorthwest'', Eve Kendall helps protagonist Roger hide from the police after he's MistakenForMurderer and things quickly get steamy. She's soon shown to be in contact with the bad guys, receiving instructions and sending Roger on a SnipeHunt designed to get him killed. [[spoiler:Subverted when it turns out that she's actually TheMole for the good guys and hated sending Roger into danger, but had to do so to avoid blowing her cover, and her feelings for Roger are genuine.]]
* ''Film/GetOut2017'' has this as one of the big reveals. [[spoiler:Rose, the girlfriend of protagonist Chris, has been in on the Arimitage family's bodyjacking and brainwashing legacy the entire time, and has led ''several'' other black lovers to that horrifying fate. She fully intended on Chris being used the same way, and in the climax was even willing to kill him.]]

* ''Literature/Utopia58'': [=LE905=]/Ellie seems to fall in love with [=KB209=]/Kay and gives new meaning to his life, inspiring him to rebel against Isonomia and seek freedom, and they have a loving relationship. Then she turns out to be the Father, the BigBad themself, and reveals she used Kay to snuff out the rebels threatening her empire. She explains that she “loved” him but in a shallow way.

* Igor is this to Alyona on Series/NineteenFortyOne, ''Series/NineteenFortyOne''.

* While he's not a full LoveInterest due to his plot being mostly DummiedOut, Bishop of ''VideoGame/NeverwinterNights2'' for a female protagonist. He will always betray her to the King of Shadows at the end of the game, and there is nothing she can do to stop it; at best she can persuade him to walk away from the battlefield, but he won't rejoin her side. [[spoiler:[[RocksFallEveryoneDies And then a bunch of rocks fall on them both]].]]
* Played with for Morrigan if you romance her from ''VideoGame/DragonAgeOrigins''. At the start of the game, her mysterious witch hermit mother saves the PlayerCharacter and their NumberTwo Alistair from certain death, and both assure you they have no ulterior motive besides wanting to aid you in saving the world from the [[WorldWreckingWave Blight]], despite them both exuding DarkIsEvil vibes. If the male protagonist pursues a relationship with Morrigan, she's convinced LoveIsAWeakness, struggles with WhatIsThisFeeling, and practically begs you to break up. Towards the end of the game, she reveals [[spoiler:she and her mother always planned to convince you (or one of your male Grey Warden companions) to impregnate her in a mysterious dark magic ritual that will lead to her fetus being possessed by the soul of an Old God, after which she'll leave to raise the child Maker knows where for Maker knows what reason.]] The player can accuse her of betrayal, though she argues that [[ExactWords she was always upfront about wanting to aid you till the Blight was over, and she has done just that]]. For the ''Witch Hunt'' DLC, [[spoiler:the protagonist may agree with her, or stab her for it.]]
* Anders in ''Videogame/DragonAgeII'' if he is your love interest. No matter what you do, he will blow up the Chantry near the end of the game in order to start a war between the two major factions, even if you are trying to be neutral.
* Solas from ''VideoGame/DragonAgeInquisition'' to a female elven protagonist who romances him. [[spoiler:Turns out he was the GreaterScopeVillain all along, although he assures you that what you had was [[ItMeantSomethingToMe real]], and he [[ShooTheDog only broke up with you]] because he knows [[MoralityPet you're the only person who can still talk him out of]] [[UtopiaJustifiesTheMeans trying to destroy the current world to restore the old one]].]]
** Averted for the Iron Bull should you romance him, since he tells you straight up when you first meet that he's a spy for the [[ScaryDogmaticAliens Qunari]], and will be sending reports back to them (and them to you) as-needed. [[spoiler:Subverted in the ''Trespasser'' DLC if you had Iron Bull reaffirm his loyalty to the Qunari in his personal quest. The Qunari reveal they were always planning on betraying you and had sent him as a [[JustForPun sleeper agent]]. If you convinced him to stay loyal to the Qun, then when his commanding officer orders him to kill you he coldly tells you "NothingPersonal, ''[[ItIsDehumanizing Bas]]''[[note]]Qunlat for "thing"[[/note]]," forcing you to kill him. If you had convinced him to leave the Qunari, then he basically tells his former commanding officer to shove it when she orders him to kill you.]]
* [[spoiler: Penelope]] of the ''VideoGame/SlyCooper'' games. [[spoiler: She betrays Bentley]] due to his devotion to his friends over her, and becomes a major antagonist in [[VideoGame/SlyCooperThievesInTime the fourth game]].
* In ''VideoGame/TalesOfXillia'', [[spoiler: Alvin]] was this to [[spoiler: Presa]] in the past. A rare case where the traitor is on ''your'' side [[ChronicBackstabbingDisorder (well, at least half the time)]] and the one betrayed is a villain. [[spoiler: (Though she's actually a Type IV AntiVillain) It's implied she genuinely loved him, but... a complicated string of betrayals got in the way.]]
* Played with in ''VideoGame/FireEmblemAwakening'': [[spoiler: The Avatar ''can'' be one of Prince Chrom's love interests if female, and has massive HoYay with Chrom if male... but the part where s/he kills Chrom and thus kicks off the BadFuture happens whether the Avatar is a male or a female ''and'' whether a girl Avatar is married to Chrom or not.]] Also, [[spoiler: s/he doesn't do it ''willingly'' but only when his/her body is taken over by the EvilGod Grima, whom s/he is supposed to be the vessel of... and the plot of the game as a whole is about ''preventing'' the BadFuture (and thus the Avatar's betrayal) from taking place.]]
** If you're playing ''VideoGame/FireEmblemThreeHouses'' and didn't choose to [[spoiler:witness Edelgard's coronation]] in the Black Eagles route, you're in for a nasty shock if you're trying to A-Support [[spoiler:Edelgard or Hubert]] with just about anyone they can potentially marry.

* ''VideoGame/GrandTheftAutoIV'' has this in the form of "Michelle", Niko's first potential girlfriend, who actually works for a shadowy government agency. Played with, as she's terrible at getting information from Niko, and it's clear that she regrets lying to him.
* Yuna from ''VideoGame/FinalFantasyX''. [[spoiler: When she finds out that Seymour killed his father and plans more deaths, she agrees to marry him, so she could get close to him and kill him. Later, when he's already dead she marries his ghost so she could send him to the Farplane, making her rare heroic example of this trope.]]
* ''Franchise/ResidentEvil'' has several of these throughout the franchise, though mostly ShipTease as opposed to explicit romance.
** Ada Wong in ''VideoGame/ResidentEvil2'' starts out as one, manipulating Leon to assist in her mission to steal a sample of the G-Virus. But she ultimately ends up InLoveWithTheMark and seemingly sacrifices her life to protect him. Since then, she's become the Catwoman to Leon's [[DatingCatwoman Batman]].
** Heroine Claire Redfield has a terrible track record with these to the point she suffers from the CartwrightCurse. In particular, she has ShipTease with Neil Fisher in ''VideoGame/ResidentEvilRevelations2'', and later discovers him to be a MoleInCharge that sold them out as part of a deal with the BigBad.
** In ''Manga/ResidentEvilTheMarhawaDesire'', [[spoiler: Bindi Bergara]] is teased as a LoveInterest to protagonist Ricky. Turns out, she's actually a BitchInSheepsClothing and the behind the events plaguing the Academy.

* ''VideoGame/DeadInVinland'': The snarky teenage daughter of the protagonist family can have a romance with a sweet gentle young man who's willing to turn away from his religious vows for her... and he later turns out to be a possibly-demonically-possessed SerialKiller who murders another party member.

* The player character, in ''VideoGame/BaldursGateII'', has this possibility. In chapter V, the player character is disguised as a Drow to infiltrate their city, and a relationship of sorts can be established between the player and one of the Drow, but ultimately the player will betray them one way or another. Of course, being Drow, most relationships are basically based on betrayal anyway.
* [[HotScientist Megan Reed]] plays with this trope in the ''Franchise/DeusEx'' prequel games. In ''VideoGame/DeusExHumanRevolution'' she is the protagonist Adam Jensen’s ex and is kidnapped in the beginning of the game. Adam spends almost the entire game trying to find her, only to find her being treated rather comfortably in an Illuminati facility. Adam can also discover evidence that she might’ve gotten close to him, only for the purpose of [[DoubleEntendre obtaining a genetic sample]]. And the post-credits stinger shows Megan conversing with Bob Page, the BigBad of the original ''VideoGame/DeusEx''. And in ''VideoGame/DeusExMankindDivided'', Adam can find a data pad in a Versa-Life[[note]]BobPage’s biotech company[[/note]] vault, stating that Megan is continuing to use his DNA to build superior bonding processes for mechanical augmentations, but the process can also be used as a particularly nasty bioweapon against augmented people. It is an AmbiguousSituation whether she is being used, or is in on Bop Page’s schemes.

* In ''VisualNovel/{{Tsukihime}}'', [[spoiler:Kohaku]] has this role on their route. The two [[spoiler: stay together afterward]].

* In the ''WesternAnimation/SupermanTheAnimatedSeries'' episode "[[Recap/SupermanTheAnimatedSeriesS3E8SupermansPal Superman's Pal]]", Jimmy discovers that his new girlfriend, Tina, is working with Metallo and only wants him as bait for Superman. The last we see of her is him locking her in a closet before going off to help the superhero.
* In the ''WesternAnimation/KimPossibleMovieSoTheDrama'', Eric romances Kim and takes her to the Junior Prom. When Kim and Ron rescue him from Dr. Drakken, he reveals that he's a syntho-drone and has been working for Drakken all the time. When Ron consoles Kim and reveals his own feelings for her, [[TheyDo the show's real romance finally begins]].
* Helena in ''WesternAnimation/NeoYokio''. Despite being in love with Kaz, she [[spoiler:tricks him into helping her and backstabs him by switching places with Sadie and running away with Charles at the end of the show.]]

* [[FemmeFatale Fiona Fox]] in ''ComicBook/SonicTheHedgehogArchieComics'' becomes this, revealing that she has been cheating on Sonic with his EvilDoppelganger Scourge for some time. This is despite her having previously claimed to have realized her grudge against Sonic for leaving her behind in Robotnik's prison when they were kids was misguided, as she now knows he did not know she was in there; she now uses this event as a justification for her cheating and betrayal. For the rest of Archie's run until Archie's legal troubles forced a soft reboot that removed her and several other characters from the story for good, she is firmly on the side of the villains.

* Subverted and played for dark comedy on ''Series/{{Haven}},'' when Jennifer, under the influence of a substance that induces paranoia, abruptly acusses Duke of seducing her for her supernatural abilities the episode after their RelationshipUpgrade. Loudly. In the middle of the Haven police precinct. This come right the hell out of nowhere for Duke, who was ''not'' aware she was infected, and his response [[StunneSilence is]] [[JawDrop priceless]].

* [[HotScientist Megan Reed]] plays with this trope in the ''Franchise/DeusEx'' prequel games. In ''VideoGame/DeusExHumanRevolution'' she is the protagonist Adam Jensen’s ex and is kidnapped in the beginning of the game. Adam spends almost the entire game trying to find her, only to find her being treated rather comfortably in an Illuminati facility. Adam can also discover evidence that she might’ve gotten close to him, only for the purpose of [[DoubleEntrende obtaining a genetic sample]]. And the post-credits stinger shows Megan conversing with Bob Page, the BigBad of the original ''VideoGame/DeusEx''. And in ''VideoGame/DeusExMankindDivided'', Adam can find a data pad in a Versa-Life[[note]]BobPage’s biotech company[[/note]] vault, stating that Megan is continuing to use his DNA to build superior bonding processes for mechanical augmentations, but the process can also be used as a particularly nasty bioweapon against augmented people. It is an AmbiguousSituation whether she is being used, or is in on Bop Page’s schemes.