A rare case where The Protagonist— who is clearly not celibate — doesn't end up with the romantic female lead. Someone else wins her heart or she has no choice but to marry someone to save her family or something. For whatever reason the hero ends the story alone. It can be played either for comedy or tragedy. It isn't always a Downer Ending, but it sure does tend to be that way.
Despite the name this trope can just as easily apply to not getting the guy.
Compare to Better as Friends and Romantic Runner Up. Contrast Everything but the Girl, where the protagonist usually does get the girl eventually. Not to be confused with two leads not ending up together because one of them dies — that is a different trope, and Platonic Life Partners where neither of them wanted each other in the first place. See also Dump Them All, where the protagonist rejects all of his Love Interests instead of them leaving him.
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Anime and Manga
A running gag for Sanji in One Piece. For a womanizer, no single woman was ever seen falling for him. Zoro and Kuina is straighter example. Life was unkind to the guy.
Despite having three potential Love Interests, the main character of FLCL ends up with no one. It implies that he will end up with Ninamori but only after they're not kids anymore and are more mature. This is averted in the manga, where he ends up with Haruko but he has to chase after her.
Yamcha gets a hardcore case of this in the Cell Saga of Dragon Ball Z. Bulma, whom he spent more than half of his life after, ends up with Vegeta. While he continues dating other women, he never married which had been his dream.
Inevitable in nearly all installments of Weiss Kreuz due to the protagonists being Doom Magnets - the few potential love interests who don't end up dead get the It's Not You, It's My Enemies treatment. The only exception here is Farfarello, who leaves with his love interest in the end of the Schwarz audio drama to lead a happy, killfree life.
The heroine, Hitomi, chooses to go back to Earth while Van stays behind in Gaia to help his world heal from the war it just endured. Despite the show being dramatically cut down from its planned run, that was the intended ending all along.
Kamina dies shortly after he and Yoko admit their feelings towards each other.
Katan goes into a suicide mission after kissing Yoko (which cemented her status as the person with "the kiss of death" in the fandom) and it seems she reciprocated his feelings, as in her personal Lotus-Eater Machine one of her alternate/happier lives has her marrying him.
Simon and Nia get married, but immediately afterward, she fades away due to an earlier Heroic Sacrifice.
In The Girl Who Leapt Through Time, Makoto doesn't get together with Chiaki, which is especially egregious considering he asked her first and through how much trouble and grief she went through to make it happen. Although it is indicated that they plan to meet again in his time:
In the SlayersLight Novel series, the bounty hunter Luke constantly tries to win the affections of his perpetually grumpy partner Millina, all to no avail. This ultimately comes to a climax in the fourteenth novel when Millina is stabbed with a poisoned knife and denied any medical care. She more or less tells him off, telling him to keep on living and don't bother worrying about her.
Princess Tutu: Ahiru does not get the boy, but gets to stay with Fakir as a duck.
Welcome to the NHK: though they stay friends. At least in most versions. The anime and novel both end fairly ambiguously, but the manga has Satou promise to rekindle their relationship after he cleans up.
Hazuki from Yami to Boushi to Hon no Tabibito never gets her girl Hatsumi, at least in the anime, despite her valiant efforts of chasing her through several alternate dimensions. It is heavily implied that Hatsumi grants Hazuki one night with her, but then erases her memory afterward, which caused quite a bit of outrage among yuri fans.
This trope has been displayed between Jiraiya and Tsunade. Even in his final moments, Jiraiya reflects that he failed in winning Tsunade's affection. Making this even worse, Tsunade implies that she was going to confess to him when he returned.
Also, Sakura Haruno and Sasuke Uchiha, thanks to the latter's Face Heel Turn.
Fantastic Children fits this perfectly and its even a large part of the plot. He seems to eventually accepts to live with it. The guy she picks is a good guy and all, but it is still a bit of a downer.
School Rumble. Tenma is the lead female. Kenji is the lead male. Tenma never returns Kenji's feelings; she doesn't even know about them. Not that it would really make a difference since she's too much in love with the second male lead. Tenma ends up with the amnesiac, brain damaged Karasuma. It's strongly suggested Harima ended up with Eri. The one who Did Not Get the Girl actually didn't get the guy: Yakumo. She's the only main character who definitely didn't get anyone.
This is played straight in the third act of 5 Centimeters per Second, despite a good taunting/glimmer of hope thrown in for good measure at the end—which doesn't pan out.
In To Aru Majutsu no Index and its spinoff, Kuroko goes to great lengths to get a hold of Mikoto. Mikoto doesn't seem to "swing that way" though and is herself mostly focused on the male lead Touma.
In Pokémon Special, Steven teases Wallace, knowing that the real reason that the Water-type trainer stepped down from being the Champion to become a Gym Leader was for an excuse to spend more time with Winona. Too bad that is one of the reasons that is implied why they broke up. (The main reason was that Winona felt uncomfortable having someone stronger than her for a boyfriend.)
Likewise with Meowth in the in the Pokémon episode "Go West, Young Meowth", who tries to help his love interest who spurned him in the past. He defeats his long hated rival Persian but the girl Meowth chooses the Persian over him.
The final chapter of Ciguatera reveals that protagonist Ogino eventually broke up with his hot girlfriend Nagumo, after realizing he has become dependent on her and lacks the maturity to give her a happy life. Nagumo is last shown 9 months pregnant and married to someone else, while Ogino got his act together and found a new love. It's probably for the best and they're both shown to be happy.
Code Geass had a field day with this trope; Shirley died shortly after her Anguished Declaration of Love so she and Lelouch didn't end up together. Season 2 also spent a lot of episodes teasing the sexual tension between Lelouch and Kallen. That also came a to a halt when Lelouch willingly pushed her away so she wouldn't get involved in his final plan. Finally, Lelouch also didn't end up with C.C. because of his own death. Suzaku also did not get Euphemia; although they were in a relationship briefly, Euphie gets shot by Zero/Lelouch after the SAZ Japan massacre. And, given the subtext, Lelouch did not get Euphie either.
The manga ending for Xxx HO Li C follows much in the same vein. Set in a Distant Finale 100 years in the future where Watanuki has lost both Himawari andDoumeki to them dying of old age. Made even sadder by the fact that after Tsubasa ended Watanuki couldn't leave his Inn Between The Worlds and that its very nature was harmful to Himawari making her only able to see him once a year, and she eventually moved on with her life. He comes to accepts it though, congratulating her on her marriage.
Played with Onani Master Kurosawa. Kurosawa starts an unholy alliance with Kitahara, which later stars blackmailing him. It's the perfect set-up for an eventual love story, right? Guess again; Neither Kitahara nor Kurosawa seem particularly interested in each other, aside from their common goals. In fact, Kurosawa is in love with cute, bookish Takagawa during most of the manga. At first she seems to have an interest on him, but eventually she starts dating Nagaoka, afro-otaku extraordinaire. That can't last, right? She's the princess of the High School and he's a clown. Wrong. Kurosawa gets over Takagawa, who seems quite happy with Nagaoka, and ends dating Sugawa, the yankee that beat his ass because he came over her uniform to avenge Kitahara.
In Princess Mononoke, Ashitaka and San fall in love. However, at the end, they realize that neither of them could give up their lives for each other, and the two part, promising to still meet as friends.
Gender-inverted examples are common in the Macross series:
A similar fate happens to Ranka Lee in the second Movie of Macross Frontier, where Alto Saotome declares that he loves Sheryl Nome, but Ranka believes that one day Alto will come back and Sheryl will be awake from the coma.
The 2003 anime version of Fullmetal Alchemist ends this way (twice): in the TV ending, Ed is trapped in our world searching for a way to get back while Winry and Rose are left behind, and in The Movieafter finding a way back to Amestris and reuniting with Winry, he realizes that our world needs him more than Amestris and seizes his last chance to return and seals off the portal connecting the two worlds for good, leaving Winry behind yet again.
Yorick in Y: The Last Man in two different ways. First, he discovers that his girlfriend Beth, who he has been right around the world to find again, was planning to break up with him (and even the death of all other men doesn't help.) But he realised that he'd fallen in love with his bodyguard, and the feeling is mutual...until she's shot by a sniper. Regardless, Beth ends up with Yorrick's sister, Hero. So, you might say that Hero gets the girl, even if "the hero" doesn't.
In the Uncle Scrooge comics, one of the most attractive things for shippers about Scrooge and Goldie is that they only spent that one month together and then, driven apart by their pride, went their separate ways, never to see each other again for fifty some years. Don Rosa was strongly tempted to write more meetings between them when he took over the Scrooge McDuck Universe but resisted the temptation to ruin the tragic romanticism of this trope.
Empire State: Jimmy screws up the courage to confess his feelings for Sara, only to discover that she's found a boyfriend since she moved away. She does let Jimmy kiss her, which is implied to be more out of pity than romantic attraction ("Listen, kiddo, that's just to get you through the next year or two."); if you tilt your head and squint, you could interpret it as a Maybe Ever After ending.
For all the troubles Weakling Smurf went through in The Smurfs comic book story "The Olympic Smurfs", he winds up not getting Smurfette (or at least, not getting a kiss from Smurfette) by the story's end.
Played with in a very gruesome way in Les Légendaires during the Anathos Cycle. As the protagonists prepare to fight the God of Evil Anathos, Danael, feeling tired with everything that happened so far, eventually fully confess his feeling to Jadina once and for all, and proposes her to marry after the fight. She agrees and they share a kiss... then after the fight, Anathos ends up taking over Danael's body. And when the heroes fianlly defeat Anathos at the end of the Cycle, Jadina is forced to stab Danael in order to succeed. Though he's then ressurrected, he has left the group and is convinced to leave the past behind him, while Jadina replaces him as The Hero.
As a young man, Superman never married his college love Lori Lemaris, who turned down his proposal and finally married someone else. Of course, Supes eventually fell in love with Lois Lane and even managed to stay friends with Lori, so it all worked out okay.
King City: Joe and Anna broke up a couple years before the comic starts, and Anna has a new boyfriend. Joe, back in the city after being gone for those couple years, spends a fair amount of time moping over her, leading the reader to believe he'll try to win her back. But in the end, after helping Anna rescue Max, Joe accepts that she's not his girl anymore. It looks like they'll remain friends.
Requiem for a Dream ends with Jared Leto's arm being amputated, Jennifer Connelly prostituting herself for heroin, their Black Best Friend in jail, and Jared Leto's mom in a mental institution. Jared Leto, the main-est of the main characters, doesn't even bother asking the random Asian nurse to phone Marion, because he knows there's no way she's ever coming back. Downer Ending? Why yes, yes it is.
Annie Hall ends with the main characters breaking up.
Toward the end of Harold Ramis' remake of Bedazzled (2000), the hero finally finds the courage to ask out his Love Interest. As it turns out, she's seeing someone. This is actually a plot point: at the beginning of the movie the main character mentions that she's recently split up with her [unseen] boyfriend, and his final wish, that she have a happy life, apparently undoes the break-up. He handles it admirably, given what he's been through. Although, bizarrely, the hero does then end up with another, kookier, more down-to-earth girl who is played by the same actress.
Batman Begins, in which Rachel Dawes decides that Batman's commitment to Gotham won't allow him a fulfilling relationship with her. This door slams shut for good when she is murdered in The Dark Knight.
In The Dark Knight Rises he meets a new love interest, who turns out to be the real antagonist of the film. The trope is finally averted when he gets together with Catwoman.
In Tim Burton's Batman Returns, Batman did not get to be with Catwoman in the end, though she is hiding right behind his back.
The original ending to Euro Trip, as a subversion of the standard formula for teen comedies; the writers eventually went with a more traditional ending.
Unsurprisingly, it happens in He's Just Not That Into You. Surprisingly, it's played straight, and out of the three relationships followed, only two of the three result in a relationship in the end.
In Every Which Way But Loose, Philo finally finds Lynn, but after discovering she's a hustler and having her slap him repeatedly, he simply walks away, leaving her crying on the ground.
A Few Good Men. Once the case is over, Tom Cruise and Demi Moore don't get together. They just leave. This aspect of the film could be considered a parody of the typical movie conventions of protagonists always getting with the heroine regardless of their relationship working out in reality. In the case of this film, the pair were only brought together due to the legal case the plot follows. Though they had chemistry, it is noted that they have no grounds for a dedicated relationship once the trial is over.
Streets Of Fire. Hero rescues his ex-girlfriend, but she stays with her current boyfriend. He rides away with his tough female sidekick, who insists that he's not her type.
Superman Returns plays with this; Superman isn't ever going to wind up with Lois because she's engaged to Richard, but Richard will never see her fully commit to him either because she still loves Superman. The real 'fun' comes in when you realize that the only way that the situation will ever be resolved is by eliminating a corner of the triangle. And then there's the little revelation that Superman is the biological father of Lois's son, Jason, yet the guy who Jason has seen as his father for his entire life has been Richard.
The Third Man, with its famous ending shot of the hero's love interest walking coldly past him without even a sidelong glance. The film pulled this off so well that its ending was lifted almost verbatim in both The Departed and Miller's Crossing.
In The Terminal, Viktor, despite his huge effort and all the sweet things he tried, did not end up with Amelia, who ended up resuming her affair with the married official. Definitely was a bit of a downer, though quite a few reviewers later admitted that if she's like that, he's better off without her.
In Darkman, Peyton leaves Julie immediately after rescuing her. Not because he's disfigured (which she has faith he'll be able to fix), but because he's done so many terrible things for the sake of revenge that he now feels unworthy of her love, or anyone's.
In Up in the Air, George Clooney's character did not get either girl.
Love Actually - Part of the Bittersweet Ending, Sarah and Karl don't end up together. A lesser extent is with Mark. He cares deeply for his friend Peter and was in love with Peter's girlfriend/wife Juliet for some time (to the point he even pushed her away out of loyalty for Peter and to save himself from the pain) but couldn't reconcile his feelings towards both because they were getting married. It arguably ends well as Mark never expected to get Juliet from Peter and she gave him a pity kiss and they are able to get along as friends.
The original Conan the Barbarian film has Conan gain wealth, vengeance, and the favor of a king... but in doing so he lost Valeria, his love. Even the epilogue, showing him as a king in the distant future, reveals he is still alone.
In Cast Away, when Chuck returns, his girlfriend is already married to another man, since she thought him dead (he was away for several years).
J from Men In Black 2 mainly cause the love interest is an alien princess and needs to return home to ensure the safety of Earth. This line pretty much sums it up.
Laura: It's not fair.
Jay: It never is.
The protagonist from White Men Can't Jump. He actully does start out with her as his girlfriend. But she leaves him to start fresh and manages to becomes a champion on Jeopardy. He goes on to win her back. But is pulled back into basketball hustling to save his friend who had been robbed. They win the game but she leaves him without saying goodbye, the irony to this was that it was meant to be his last game.
The Wrestler has the main character choose the self-destructive life of wrestling rather than retire into obscurity with his new girlfriend. It's implied that he dies in the ring.
The romantic comedy/road movie Forces of Nature, where said forces seemingly conspire to make single mom Sandra Bullock and Ben Affleck a couple, but which ends with them going their separate ways.
An unusual version is done in The Brothers Grimm - both of the brothers love Angelika and both get a kiss with her at the end, but she never actually hooks up with either of them. This is even lampshaded.
Jacob: I always thought that you would end up with the girl.
William: Well you see that? *points up*
Jacob: What, the sun?
William: The day is not over yet!
In TRON, Flynn does not permanently hook up with either Lora, his former girlfriend (for whom he still has feelings) at the start of the film, or Yori, her program counterpart, although he kisses the latter just before he leaves the electronic world, believing that he's about to die.
The Green Hornet, refreshingly, has neither of the lead men get with Cameron Diaz's character despite repeated attempts to woo her, because (sensibly) she is not crazy about being treated like an object for them to use and fight over.
At the end of The Maltese Falcon, Sam Spade turns in Brigid O'Shaughnessy for the murder of his partner.
There's a subversion in the dance movie Centre Stage. Peter Gallagher's character has married Ethan Stiefel's ex-girlfriend, and at one stage he snarks: "I got the girl." Later on, Stiefel wins over a rich, elderly woman who promises to fund his own dancing company and in doing so, allow him to leave Gallagher's theatre. He tells Gallagher: "I guess this time, I get the girl."
Wild Wild West - the female lead reveals that Dr. Escobar is not her father, but her husband.
The Town - Doug is forced to flee Boston and can likely never return due to the FBI manhunt.
Lucas - Though Lucas Bly tries desperately to win the heart of new girl Maggie (even joining the football team), she sees them as being better offas friends and goes for Cappie Roew. Maggie even says, "We're Just Friends, Lucas," at one point.
In Brick Brendan's first love interest dies at the beginning, and his second turns out to have orchestrated her murder.
Thor did not manage to end up with his love interest Jane since he destroyed the bridge that connects Earth to Asgard by the end of the film.
Played rather tragically straight in Captain America: The First Avenger. In a great adaptation of a famous plotline from the comics, Steve Rogers forces the Red Skull's flying wing down in the Arctic to save New York and other major U.S. cities. Peggy Carter, Steve's comrade and love interest, has him promise to take her dancing the next week, with both knowing he's all but guaranteed to die in the crash. Once Steve awakens seventy years in the future, the realization must set in that even if Peggy is still alive, and he somehow managed to find her again, she'd be an old woman of at least ninety, almost certainly with a family. Needless to say, a date to go dancing would most likely be out of the question.
Nick Fury-(after just breaking the time issue to Steve) "Are you going to be okay?"
Invoked straight in an early work of Francis Ford Coppola titled You're a Big Boy Now. In this movie from 1966 Bernard, the protagonist, suffer this fate at the end, after spending all the movie chasing Barbara Darling. Actually, he doesn't get that girl...
In "Experiment in Terror" FBI agent Glenn Ford does not wind up with victim Lee Remick. They never have a moment, they do not have sex, there is nothing between them. This is the rare example of Truth In Television because it's his job and just being in a stressful situation together doesn't lead to two entirely different people who did not know each other before falling in love and living their lives together.
In The Scorpion King 2: Rise of a Warrior, young Mathayus finally kills the Big Bad (his father's murderer) and ruins the plans of an evil goddess. As his Love Interest approaches him in a seductive manner, prepared to be his queen, he suddenly smiles and rides off into the sunset without her. So not only did he refuse the girl (with nothing in the film foreshadowing this) but he also refuses the crown. Would Akkad still fall (in the first film, Mathayus is the Last of His Kind), if Mathayus stayed?
In John Tucker Must Die, Kate changes her mind about humiliating the titular character but the other girls play the pre-recorded "I'm Dumping You" video. Defying genre convention, he doesn't take Kate back either and they remain as friends.
In Splendor in the Grass, where the male and the female leads are equally important characters, he ends up married to someone else.
Clerks has Dante having trouble choosing between his current girlfriend Veronica or his ex Caitlin. Ultimately he realizes that Veronica is the one he loves, but thanks to Randall's interference she believes he loves Caitlin and breaks up with him. Although the ending implies he'll try to clear things up with her, related material and future films have pretty much made it clear they never got back together (or if they did, it didn't last). Ultimately averted in the sequel where he gets together with Becky Scott.
Quasimodo:(to a statue, sobbing) Why was I not made of stone like thee?
Despite all of the eponymous characters attempts to win the girl in The Great Gatsby, she stays with her husband. Gatsby takes a lie for her that gets him killed.
Severus Snape did not get the girl, the girl being Lily Potter nee Evans, before the events of the Harry Potter series, as revealed in the 7th book.
Adrian Mole never manages to get his most constant love interest, Pandora Braithwaite, back after the final end of their on-off (and unconsummated) relationship in their early teens. Every time he falls in love with another woman, the relationship ends disastrously, leaving him with two failed marriages behind him.
Elaine (who shows up later in the books than Susan, but who Harry has known longer): She and Harry fall in love when they teenagers both apprenticed to a dark wizard; when Harry turns against the dark wizard Elaine betrays and nearly kills him (we later find out she was under a geas); and now they've run into each other occasionally but are in no kind of relationship.
Susan Rodriguez was the steadiest girlfriend he had, and they were genuinely in love. Literally; Susan's love for Harry protects him from the White Court. Unfortunately, bad decisions on both their parts ended with Susan becoming a half-vampire and forced to go on the run for the rest of her life, though not without carrying Harry's child. In the end, Harry ends up killing her to trigger a bloodline curse that kills all of the Red Court vampires in the world. Ouch....
Shiela, a girl working at an occult bookstore with perfect memory recall, seems like a good possibility in Dead Beat. Turns out she's just a psychic projection/mental clone created by the Fallen Angel residing in Harry's head. He does actually manage to redeem the demonic entity, right before she kills herself to save his life. Oof.
Although Word Of God is that Lash showed up in Ghost story... somewhere, ss did Lasciel.
Anastasia Luccio, fellow wizard born three centuries ago, who got dumped in a pretty young girl's body via magic and developed a budding relationship with Harry. Turns out she was mind-controlled by an agent of the Black Council into being attracted to Harry to keep tabs on him. That...really puts a downer on that romance.
Karrin Murphy, who Harry has the most ongoing chemistry with. They planned to take the "unresolved" out of their Unresolved Sexual Tension at the end of Changes, but then Harry catches a bad case of sniper. Well, shit.
In "Cold Days", Karrin and Harry finally have a Big Damn Kiss, but she has very good reasons to hesitate, such as Harry gets a hard-on when killing, thanks to the Winter Knight's Mantle and an arguably better potential match for Harry in Molly who is now the Winter Lady after Maeve's death.
And Harry did manage to bed Mab, the Winter Queen of Faerie, Queen of Air and Darkness. But nothing good is coming out of that.
Word Of God is that Jim Butcher has no idea who Harry ends up with.
Hans Christian Andersen's "The Little Mermaid" did not get her Prince though in every way she deserved to. Here, too, the film adaptation changed this (and even added a sequel about the daughter born to the marriage which did not happen in the original...).
The ending of the classic Robert Munsch children's tale The Paper Bag Princess has the eponymous heroine not getting the prince because she looks too unkempt. She therefore decides that the prince isn't good for her if he won't accept the way she looks, and calls him a bum. The last line of it is "They didn't get married after all." In the short animated adaption of this story, she hooks up with the dragon instead. Dead serious.
Terry Pratchett's Discworld novel Sourcery; Rincewind meets Conina, daughter of Conan the Barbarian, and while in Al Khali searching for the Arch-Chancellor's hat, begins to develop a crush on her. Later, he meets wannabe barbarian Nijel who ends up falling for Conina and vice versa. Several other novels have this example, too, among them Pyramids (see also: Star Wars) and Interesting Times, but notably notGuards! Guards!!, despite Vimes' tendency to quote Casablanca (see).
Philip Pullman's His Dark Materials: Will and Lyra. While they do share a mutual attraction to each other and eventually consummate their relationship spend some romantic time together, it can't last since the laws of the multiverse decree that they live in their separate universes and try to make the world a better place individually. (No complaining about the ending, here, just hanky-filled reminisces.)
Daisy Miller is not a Tear Jerker because the girl dies but because the guy doesn't realize her worth while she's alive.
The First Law plays this straight with Logen/Ferro and Jezal/Ardee, making two heroes who did not get the girl...but, at Jezal's expense, deliciously subverts it with Glokta, Hero #3... depending, of course, on how you define "hero."
Dean Koontz's novel Your Heart Belongs to Me ends like this, which is something of a break in formula for him.
Thomas Hardy's Jude The Obscure. Subverted in that he does get a girl, but she's not the main romantic lead and she's a complete harpy. Played straight in that Sue decides to go back to Philloston after the big tragedy.
Bella of Twilight really needs to re-read Wuthering Heights because, far from Heathcliff and Catherine not letting anything keep them apart, Heathcliff does not get Catherine. In fact, he marries her sister-in-law Isabella.
Kim Stanley Robinson's Pacific Edge. Kevin Claiborne does not get Ramona; instead, she goes back to her Jerk Ass boyfriend, Alfredo.
Martin Cruz Smith's Gorky Park. Arkady Renko tells damaged love interestIrina Asanova to stay in America while he'll return toCold War era Russia. It was her dream to escape the Soviet Union, and Renko doesn't find America to be any better than the USSR.
Book Of The New Sun: Severian's first love, Thecla ends up killing herself to avoid the torture and his amnesiac second love, Dorcas leaves him when she finds out that she is his grandmother. It should be noted that although Thecla dies, Severian's persona is merged with hers through a sort of cannibalistic Eucharist.
Happens in the James Bond novels more regularly than the films would have you believe. (In the very first novel, the love interest commits suicide, in Moonraker she's engaged to another man, in OHMSS his wife is murdered at the end, in From Russia With Love Bond is poisoned before any consumation can occur).
If one goes with the theory in A Song of Ice and Fire that Petyr 'Littlefinger' Baelish is what would happen if a stereotypical fantasy hero was plonked into a Crapsack World, then this is the reason why he's so screwed up and why Westeros is now even more of a Crapsack World.
Circe and Calypso in The Odyssey - both fall in love with Odysseus and want to keep him on their islands, but due to divine intervention (Hermes usually is involved) they have to let him go eventually. Calypso even lampshades it, complaining that goddesses are always quickly separated from their mortal lovers, usually by a male god killing them.
Eragon from the Inheritance Cycle. Never mind that Arya got a dragon, and her dragon and Saphira immediately shacked up, so both she and Eragon had a mental link to sex... except Eragon has spent a long time learning to control the link, and she hasn't. The girl he's been drooling over for the better part of four books and a year or two, they're both horny beyond their control, alone, and... they sit and chat. If Forever Alone has a patron saint, it's this guy.
Eragon was doomed from the start, unfortunately. The series makes no mention of any type of hybrid between the various races, so this would probably count as bestiality in that universe. Oromis outright says at one point "even if such a thing were possible, it would be an abomination".
This is what kickstarts the philosophizing in Repetition.
Robin Hobb’s Farseer Trilogy is possibly one of the most depressing examples. Remedied at the end of the Tawny Man trilogy, in which Fitz Chivalryfinally does get the girl he had wanted to be with the entire time after her husband dies, something like thirty or forty years later. A clear case of Earn Your Happy Ending.
Occasionally happens in the Jack Reacher novels. Die Trying is an example; while Reacher and the female lead have a mutual attraction and once engage in Glad-to-Be-Alive Sex, she is in love with someone else and moves in with (and possibly marries) him at the end of the novel.
Brian Kinney at the end of the US version of Queer As Folk. Despite having declared his love for Justin and even proposing marriage, which was what Justin wanted even though it went against everything playboy Brian believed in, the couple split up so that Justin could pursue an art career in NYC.
Shua in Sky Blue manages to bring down Ecoban, but thanks to Locke, it's almost certain Jay will die.
Tony and Michelle in Skins end up going their separate ways because of different universities.
Lee "Apollo" Adama on the new Battlestar Galactica is practically the patron saint of this trope. He blows it with at least four women over the course of the show: Kara "Starbuck" Thrace, his Star-Crossed Lover, who marries another man, dies suddenly, comes back, then disappears again leaving him standing all alone in the middle of a field and that's literally the last that's seen of him in the series. Anastasia Dualla, who he sniped away from the show's Dogged Nice Guy Billy Keikeya. She married him, divorced him, then killed herself. Gianne, his ex-fiance, who he ran out on when she was pregnant with his child no less. And Shevon, a prostitute he frequents for all of one episode and Replacement Goldfish for Gianne, who pushes him away because, well, she's a prostitute.
Played for laughs with Simon Cooper in The Inbetweeners. He spends the course of the entire show trying to win her over, usually blowing it in hilarious ways. He does get to kiss her in the final episode of series 2, but she goes back to her boyfriend.
Kamen Rider Double hinted in early episodes that Shotaro would eventually get together with Akiko, only for her to end up with Terui instead.
The Doctor occasionally does this on Doctor Who, although mostly in the Revival. He didn't get together with Rose due to a combination of Cannot Spit It Out and her getting stuck in an alternate universe. Even if he does succeed in romance, it's probably not going to last, because of his near-immortality.
They do get a somewhat happy ending at the end of Series 4. Due to a complicated series of events wherein the Doctor undergoes a partial regeneration which he aborts by channelling into his spare hand, the hand later grows into a Half-Human clone of the Doctor after absorbing some of Donna's DNA. The Doctor decides to leave his doppleganger with Rose in the alternate-universe, knowing that he can grow old with her and give her a life that he never could.
Lancelot from Merlin. In this version, Arthur/Guinevere is not a political marriage, but a real love connection. Also Merlin and Freya.
And Guinevere doesn't get the guy, with Arthur dying at the end.
iCarly: Carly Shay doesn't get the guy at the end of "iOMG", but since this is a season finale cliffhanger, the next season could resolve it differently. Resolved (for now at least) and subverted. Sam doesn't end up with Freddie either.
Though in the end, Carly does get the guy right before she leaves.
Engine Sentai Go-Onger showed that Sosuke and Miu had feelings for each other; but ultimately nothing comes of it and they return to their respective lives.
GekiRed, HurricaneRed and GoseiRed all have movie-only love interests that don't re-appear for the TV series, thus they do not get the girl.
Degrassi has JT's Abhorrent Admirer Liberty have a crush him for a long time. When they do finally get together, they end up breaking up and he died before they could get back together (shortly after revealing to his best friend he was still in love with her, and this happened on her birthday).
On a more comical note, Patience is subtitled Bunthorne's Bride. Guess who is the only male character in the play to end up without a bride...
The Student Prince: In a huge Tear Jerker moment, just as the titular prince is about to defy his father and marry the commoner he's fallen in love with... he learns his father is dying. He agrees to marry for diplomatic reasons, and takes up the crown, but goes to see his true love once more before he does.
Peter Ustinov's play The Love of the Four Colonels is set in Germany shortly after World War 2, where the four titular officers - one from each occupying power - come across Sleeping Beauty's castle and fall in love with her. Due to the machinations of the good and evil fairy, none of them gets the princess - the British and the Soviet colonel return to their wives (even though e. g. the Russian one has in the meantime given birth to another man's child), while the American and the Frenchman have themselves put to sleep so that in another 100 years they'll have another go at wooing her, even though they just know that the fairies will ensure that neither of them is successful.
Jonathan Larson's semi-autobiographical play, tick, tick... BOOM!, has the protagonist choose between pursuing his dream of being a famous composer and settling down with his girlfriend Susan and a steady job. The stakes rise when Susan tells him she is moving away, and wants him to come with her. In the end, he chooses to stay and pursue his dream, and they decide to be Just Friends, and for his birthday she gives him sheets of blank paper with which to write to her.
Zig-Zagged in Final Fantasy Adventure" - the player would think that once they beat the Final Boss and restore peace to the land, the boy and the girl would get together...however, The mana tree vanishes...and the girl has to become the Barrier Maiden to the world. Secret of Mana, however, implies that Somehow he did...as the mana tree is the main character's mother, and his Disappeared Dad was the last Gemma knight...the PC in the first World of Mana'' game,
The ending to Metal Gear Solid shows Snake and Meryl riding off together into the sunset. Cue the fourth game where Snake's an old man and Meryl gets married to the very guard she knocked out at the beginning of the first game. (See Cartwright Curse.) In addition, it seems like this in Raiden's case but it's later subverted when it's revealed it was a cover story he wasn't in on. See also Ellen Madnar and Holly White from the first two games.
And there's also Otacon. In each of the three games he appears in, there is also a woman he has a special relationship with. It never turns out well. Not well at all.
Full Throttle has the woman-not-getting-man version when Mo takes over Corley Motors, thus losing access to the free roaming lifestyle that would have kept her together with Ben.
While the ending of Persona 2: Innocent Sin is an example of that other trope, Eternal Punishment plays this straight as Tatsuya ends up returning to the Other Side, and if Maya ever gets involved with This Side's Tatsuya there'd be a risk of screwing over the world again, so seeing him or his brother isn't really an option either. The ending movie with Maya accepting this and walking by Tatsuya without saying anything is a real Tear Jerker.
In fact this is built into the title of the games; this is Tatsuya's "Eternal Punishment" for the "Innocent Sin" that he commented during the first game.
In Fire Emblem 7, this happens with two of Priscilla's potential love interests, as her noble status prevents her from being able to continue a relationship with both Guy, a poor swordsmen, and Heath, a Wyvern Knight deserter. Sain is another potential partner, but his duties to his kingdom prevent him from leaving for her and their support chat ends with them coming to this realization. Erk, her fourth option, is the only one that actually can stay with Priscilla due to him having friends in high places.
In the same title, Harken and Vaida must part ways due to their dedication to their respective lords.
Ike and Elincia in Fire Emblem: Path of Radiance, despite a decent amount of Ship Tease between them. By the sequel, the chemistry between them is nonexistent and Elincia's feelings have shifted towards Geoffrey (and possibly his sister Lucia).
Most of the origin stories in Dragon Age: Origins include an extra one-sided-or-not Love Interest, and in fact, every female Warden can run into one in hers. Needless to say, she won't get to keep him even if she wants to, a fact which is sometimes presented rather painfully.
Any male Warden who romanced Morrigan has this occur prior to end-game. The entire plot of "Witch Hunt" has the Warden attempting to track down Morrigan and their child.
Dragon Age II reveals this to be the fate of a Warden who romanced Leliana or Zevran, as the Warden seems to have vanished.
Dragon Age II has this occur repeatedly. Notably examples are if Hawke slept with Isabela but later romanced another character, several lines of dialogue hint that Isabela still has lingering feelings and regret over the relationship ending. Similarly, if a female Hawke romances Sebastian, but sides with the Mages and refuses to kill Anders, he breaks up with Hawke and leaves to raise an army to wage war on Kirkwall.
Neverwinter Nights Hordes of the Underdark reveals that the Hero of Neverwinter was good, male, and completed the romance subquest with Aribeth. And then Aribeth was executed for treason with the Hero protesting every step of the process and the Hero leaves the city, estranged from its lords and his friends.
The fan-made module The Bastard of Kosigan has the hero's former Love Interest die an unavoidable death at the hands of French assassins, even if you attempt to renew your relationship with her.
Knights of the Old Republic and the sequel has both Revan and the Jedi Exile vanish into the Unknown Regions to seek out the old Sith Empire to finish the fight, leaving behind a Love Interest (and all their allies, for that matter) in both cases.
It's later revealed in Revan that Revan did get the girl; he and Bastila were married between the two games, and she was pregnant with his son when he vanished (on a trip that was supposed to only be temporary).
The Prince of Persia (2008): Epilogue ends on this note. After an entire game's worth of semi-witty Will They or Won't They? sexual tension, Elika finally has enough and literally runs off on the Prince because he freed the God of Darkness who they spent the entire time trying to seal away, on the misguided notion that he could bring Elika back to life and use her to defeat it once and for all. Only, she didn't think she could, and didn't want to even try. Nice Job Breaking It, Dumbass.
Adol in the Ys series, almost every time. Of course, apart from Feena in I/II, it was more like the various girls Did Not Get The Guy.
Soul series: According to the Soulcalibur V profile for Leixia (daughter of Xianghua), her father is not Kilik, her Love Interest for the previous four games.
Somewhat subverted in that Kilik and Xianghua were together for a period of time; Kilik left because he realized they couldn't truly be together and thus vowed to protect Xianghua and the world she lived in as thanks for her selfless, unconditional love for him. However, he did consummate his relationship with Xianghua before departing for good, which led to Xianghua's firstborn: Xiba. In Kilik's case, it's "Did Not Keep The Girl" (or perhaps "Could Not Keep The Girl").
Tron 2.0 While it's clear Jet and Mercury were attracted to one another, he has to return to analog, and she has to stay in the digital world. Poor guy got his Honorary Uncle's luck.
Shadow Hearts does this a few times. The Canonical ending of the first ends with Alice dying, meaning Yuri did not get the girl after all. However, Yuri's next apparent love interest, Karin, Was sent into the past, meaning she did not get the guy....instead becoming his mother. But, the Stable Time Loop allows Yuri to earn his happy ending after all.
At the end of Disney's Pocahontas, John Smith, severely injured, returns to Europe, leaving Pocahontas behind. Possibly the only truth in television moment in the entire movie, acknowledging that, no, Pocahontas and John Smith did not end up together.
This carries over into the sequel, when John Smith still loves Pocahontas, but she hooks up with John Rolfe.
Batman Beyond: Throughout the DCAU, Bruce Wayne has had many love interests: Catwoman/Selina Kyle, Zatanna (one-sided only, Bruce always considered them Just Friends), Talia Al'Ghul, Andrea Beaumont, Wonder Woman, Barbara Gordon/Batgirl... He doesn't end up with any of them and ends up a single, old man.
Given that Wonder Woman of all people is hardly somebody who'd be imperiled by Batman's mostly non-powered enemies, it's probably the latter.
He also made-out with the Cheetah in a particularly memorable scene.
The Rankin/BassJack Frost special follows the titular sprite as he tries to gain the things he needs to become human: a house, a horse, a bag of gold, and a wife. He set his sights on the one girl who loved Jack Frost, the sprite... but he couldn't get her to love him as Jack Snip, the human. In the end he returns to being a sprite and she marries someone else.
Toy Story 3: Although Buzz Lightyear and Jessie, and to a much lesser extent, Mr. and Mrs. Potato Head and Barbie and Ken are now finally united with each other, Woody and Bo Peep, unfortunately aren't. (At the very beginning of the film, Bo Peep was seen only in a flashback, and when Woody lists Wheezy, RC, and the other toys that were sold before the film, Rex sheepishly adds Bo-Peep to the list, and you can see how down Woody is because of that.)
Peter in The Spectacular Spider Man, due to premature cancellation. The season two finale ends with Gwen remaining with Harry out of pity.
Also lampshaded in Spider-Man: The Animated Series at the end of the episode that introduced Kraven, where Peter complains to himself that it's supposed to be the hero (him) that gets the girl, not the reformed villain (Kraven).
Beast Boy and Cyborg in Teen Titans. With Beast Boy: first Terra had a Face Heel Turn; then a Heel Face Turn that resulted in her being turned to stone; then she may or may not have been brought back to life, but either way Beast Boy lets her go. With Cyborg: he and Sarasim do kiss, but he's transported back into the future soon after, since they do come from different times. He knows that she survived the battle, though.
In the Teen Titans: Go! tie-in comics, however, Cyborg does gain a girlfriend in Sarah, a caretaker for a group of handicapped kids, both of which are first seen in the episode "The Sum of His Parts."
A gender reversed version happens in Family Guy with Meg twice with both Joe's son and the nudist boy. She does get Neil, but then drives him away when he proves annoying.
Played for Drama in ThunderCats (2011) when Rebel Prince and royal heir Lion-O develops a crush on Cheetara, a woman he discovers is a member of his Church MilitantPraetorian Guard, he realizes his Lancer brother Tygra, also has feelings for her. As they set off on a shared journey, the two develop a passive-aggressive, increasingly toxic Sibling Triangle rivalry for her affections to which she remains largely oblivious, with both brothers interpreting the attention she pays Lion-O as romantic interest. After they come to blows over her, Cheetara takes Tygra aside and apologizes for failing to confess her feelings. She and Tygra share a childhood history, and she's carried a torch ever since he did her a favor that helped her join the Clericy. They kiss just as Lion-O walks into view, confident he's avoided a prophecy fortelling Tygra's betrayal.
Scooby-Doo! Mystery Incorporated: Shaggy and Velma have hooked up prior to the series' beginning, but he breaks it off with her when he thinks it means it'll jeopardize his and Scooby's friendship. She remains quite bitter about this for a while. This also happened with Ricky Owens and Cassidy Williams (a.k.a. Mr. E and Angel Dynamite), but in the Grand Finale's new timeline, they are Happily Married.