Spurned Into Suicide

"If I can't have you, I'd rather die!"

Someone (most likely a Yandere) can't deal with the fact that the person they love wants to leave them, becomes attracted to someone else, or is already in love with somebody else. Instead of killing their love rival or the object of their affections so they won't ever belong to someone else, they decide/threaten to kill themselves. Might also be used to guilt the object of their affections into choosing/staying with them. Of course, sometimes they even attempt to take the object of their affections with them in death as well.

When played more sympathetically or for tragedy, the rejected's despair and pain alone can be considered the impetus for suicide. Rather than spending the rest of their days with the intense psychache of unrequited love (because Unrequited Love Lasts Forever), removing themselves from the equation seems to be the easier solution. In lighter or very sarcastic works this trope may overlap with Suicide As Comedy, even when people often say Dude, Not Funny in regards to it. See also, Not Good With Rejection.

Sadly, this is known to happen in Real Life.

Anime & Manga

 * In Princess Princess Sayaka threatens to jump off a cliff when Tooru tells her outright that he only ever thought of her as a sister, saying that "If Tooru-kun doesn't choose me, I'd rather die!" He gets her to come to her senses by slapping her and saying "Don't say you want to die so easily! If you kill yourself we won't be able to see each other anymore!"
 * Played for Laughs in Slam Dunk. When the Hot Blooded protagonist Sakuragi Hanamichi is yelled at by the girl he likes (she thought he'd beaten up the guy she liked), he tried to jump off the roof of the building while crying Berserker Tears. Of course, his friends kept him from jumping and it was never mentioned again.
 * Happens at least twice in Detective Conan. The first time, the guy not only killed himself... but he made it look as if the Idol Singer who rejected him actually murdered him.
 * Played straight and subverted in Gunslinger Girl. Many chapters later,
 * Almost played straight (and for lulz) by in Persona 4.
 * Akari from Girl Got Game is a Type 2 Yandere for poor Kyo. She'd never try to hurt "him", no matter how much "he" refuses, but she is willing to threaten suicide for a date.
 * In chapter 11 Rune of Karakuridouji Ultimo is perfectly willing to kill his best friend because he doesn't love him back and then commit suicide.
 * from Sakura Gari, who after being thrown out of the  household tries to stab his ex-lover   and then commits suicide.
 * Not to forget Souma himself who tries to kill himself after Masataka tells him "I Wished You Were Dead", and then all that he had done to Masataka sank in...
 * of Riyoko Ikeda's Claudine, who.
 * Played with in Haou Airen, since
 * Berserk provides a particularly depressing example with Griffith. After enduring a year of torture that left him permanently crippled, seeing all his dreams and ambitions go up in smoke, and finding out that both his love interests hooked up with each other, he tries to kill himself and fails. Then, It Got Worse.

Comic Books

 * In an unusual instance of Black Comedy for an Archie Comics story, Big Ethel, standing on a bridge with Jughead, threatens to climb onto the ledge and jump off if he won't be hers. "Well," she says, "aren't you going to do anything?" Jughead smiles and gets down on his hands and knees, as though to give her a boost.

Film

 * The originally planned ending of Fatal Attraction had the trope namer for Bunny Boiler commit suicide at the end... before Test Audiences said no.
 * This is prominent plot point in The Rules of Attraction and is also subverted in it (when Sean Batemen repeatedly and ineffectually tries to kill himself after Lauren Hynde rejects him).
 * This happens in the first five or so minutes of Wristcutters a Love Story.
 * In Don Juan DeMarco, rejection by the one woman who really mattered is what prompts the title character to attempt suicide, and so set the plot in motion.
 * Used rather cleverly in He Loves Me He Loves Me Not..
 * Play Misty for Me: Dave (Eastwood) is a womanizing DJ who constantly gets calls from a woman asking him to play the song "Misty". He eventually meets the woman, named Evelyn, and has a one-night-stand with her. Evelyn insists on making herself part of Dave's life and, at first, Dave likes the attention. However, his ex-girlfriend, Tobie, moves back to town and Dave decides to patch things up. After he attempts to tell Evelyn that he's not interested, she responds by attempting suicide.
 * from Legends of the Fall.

Jokes

 * There's a Polish joke about a man who comes home early to find his wife in bed with her lover. He pulls out a gun and holds it to his own head. His wife starts laughing, and he responds, "What are you laughing about? You're next!"

Literature

 * Goethe's The Sorrows of Young Werther: a young wangster kills himself because his lover Charlotte is married to his friend.
 * In the Chilean novel Golondrina de Invierno, a young would-be poet and Expy of Werther commits suicide when the female lead's cousin, whom he fancies, is engaged to marry a rich friend of hers.
 * A Tale of Two Cities and Last of the Mohicans feature similar endings, i.e. the spurned lover sacrifices himself to save the one she chooses; effectively, they are spurned into suicide and take I Want My Beloved to Be Happy to its biggest extremes.
 * Les amitiés particulières (Special Friendships). Fourteen-year-old George is forced to return his twelve-year-old boyfriend Alexandre's letters, a classic method of breaking up. Alexandre promptly takes poison.
 * Borderline example in Daddy Long Legs After Judy rejects his marriage proposal,  believes she doesn't love him (which she actually does, but , so he goes hunting in Canada and nearly dies as a result. He wasn't deliberately trying to kill himself, but he was so utterly depressed that he had a very difficult time recovering.
 * Dido in The Aeneid kills herself after Aeneas leaves her. She had sacrificed her honor for him and betrayed her late husband, as widows were not supposed to remarry or take a lover. Add this to the fact that her feelings were goddess-induced and rather obsessive, and that Aeneas was kind of a jerk...
 * in The Picture of Dorian Gray, who
 * The ending of Bonjour tristesse.
 * In Peter Moore's Caught In The Act Ethan tries to tell Lydia (who's Yandere for him) that he is not dating her. Apparently heartbroken by the news, she attempts to take hers and Ethan's lives.
 * This is the modus operandi of the Deathtalker in the Portals series.

Live Action TV

 * Cheers episode "A Ditch in Time". Sam Malone gets involved with Amanda Boyer (Carol Kane), who becomes obsessed with and possessive of men she goes out with. When he tries to break up with her she implies that she'll commit suicide if he does.
 * Parodied in the Chilean telenovela Sucupira, where the local pharmacist Don Segundo constantly tries to commit suicide whenever he doubts about his Femme Fatale wife's fidelity. And since that happened very often, well... Among other methods, he tried to: I.e: hang himself, blow his brains out, throw himself in front of a train, etc.
 * This was so Played for Laughs that the poor guy was featured trying to hang himself in the OP sequence of the series. (around 1:07)
 * Sophia in Skins. Bonus points because this suicide is how we first become aware of her existence, and the reasons for her death and her importance to other characters lives are only discovered later.
 * In an episode of Supernatural, Sam and Dean have to protect a girl from a spirit who kills people who have been involved in other's deaths. The girl's past includes a boyfriend who threatened her with this trope when she tried to break up with him. When she left anyway, he did go through with it and she's felt guilty ever since.
 * In Oz after
 * Two and A Half Men: When his wife left him, Walden tried to drown himself in the ocean. Apparently he didn't realize that the water would be really cold.
 * Fran of The Nanny gets her own stalker in the form of Jeffrey Needleman, an old classmate from middle and high school. He threatens to fling himself out a window if Fran doesn't start a relationship with him.
 * In Desperate Housewives George became very obsessed with Bree after she rejected him and ultimately killed himself by overdosing on sleeping pills.

Music

 * "The Letters" by King Crimson.
 * The song "I Can't Stand Losing You" by The Police is a darkly humorous example. It's implied that he won't go through with it, though.

Newspaper Comics

 * A now infamous series of strips in the Mickey Mouse newspaper comic had Mickey attempting to commit suicide after being rejected by Minnie.

Opera

 * Cio Cio San, the protagonist in Puccini's opera Madame Butterfly.
 * "Tit Willow" from The Mikado is about a bird who commits suicide due to "blighted affection"; the song is Koko trying to persuade Katisha that he feels similarly infatuated with her.
 * Henry Purcell's Dido and Aeneas ends with Dido committing suicide after Aeneas is tricked into leaving Carthage by a false "Mercury". The story is loosely based on Book IV of Virgil's Aeneid.
 * The title character in Stanisław Moniuszko's Halka is jilted at the beginning of the opera, and kills herself over it at the very end; the plot is basically her spiral into despair.

Video Games

 * In one of the bad endings of School Days, Kotonoha falls into such a despair after being rejected by Makoto in favor of her love rival Sekai, that she throws herself off the top of the building Makoto lives in and dies in front of both of them.
 * in Fire Emblem Seisen no Keifu.
 * If you manage to get  in the Mai-HiME Dating Sim, then   will commit suicide out of spite and despair.
 * Alexander can fake this in King's Quest VI.

Webcomics

 * The Order of the Stick has Therkla, although in her case it was more "made a conscious decision not to come back to life" than commit suicide. It also wasn't the only factor in her decision-.

Western Animation

 * In the Tom and Jerry cartoon "Blue Cat Blues", Tom is sitting on a railroad track, waiting to be run over, after his girlfriend leaves him for another. At the end,
 * The Planet Express Ship from Futurama. She tries to kill herself and the rest of the crew after Bender breaks up with her.
 * In the Family Guy episode "Barely Legal" Meg threatens to kill herself after her date for the dance rejects her and also threatens to kill herself if Brian refuses to go to the dance with her.