A type of Love Triangle — heavy on the triangle, light on the love. When a girlfriend leaves her boyfriend, and ends up in a relationship with the boyfriend's ideological rival, resulting in a vendetta between the two men. It works with the genders switched around, too.
Compare Murder the Hypotenuse. See also Cock Fight and Emasculated Cuckold.
Examples:
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Anime & Manga
- Chūka Ichiban!: Chou Yu and Li Hua had their ultimate falling out when they competed for the hand of Mei Ga, Mei Li's mother. Only shown in a flashback, but their hatred moved on to sixteen years.
- Cowboy Bebop: This is one part of the relationship between Spike and Vicious. On the surface, they had one of these over Julia, resulting in the disintegration of their friendship and a lifetime of hatred toward each other. But this trope also applies to Vicious and Julia due to his feelings for Spike, which is why he hates them both so passionately but (initially) spares their lives after they betray him.
Comic Books
- Teenage Mutant Ninja Turtles: Yoshi's love triangle with Oroku Nagi over Tang Shen would help to set up a Cycle of Revenge.
Fan Works
- Danny Phantom: Stranded: Stella has been married to both Johnathan Strong and Jean-Luc Bevier at one point. Johnathan is a hardworking, law-abiding man who came from a middle-class family but became a very high-ranking lawyer while Jean-Luc is a pompous, womanizing owner of a vineyard who inherited all of his wealth.
- This Is A Wild Game Of Survival: When she sees Na-yeon and Gyeong-su getting close, she does everything in her power to sabotage any burgeoning feelings between them. After learning from Min-jae that those extinguised feelings have developed during their time in the apocalypse, it quickly becomes apparent that Ji-min hasn't learned her lesson just yet.
Films — Live-Action
- How the Grinch Stole Christmas (2000): The Grinch's girlfriend Martha almost marries Augustus Maywho, who bullied the Grinch as a child.
- The Matrix Reloaded: Niobe used to be with the mystical Morpheus, but now she is with the secular Locke. How much of the tension between the two men is a result of this and how much is due to their very different personalities and leadership styles is unclear since it all happened in the backstory. That Niobe keeps supporting Morpheus over Locke doesn't help matters much.
- Spider-Man 2: Mary Jane is constantly the center of the tug-of-war between Spider-Man and the Goblin Jr. and their alter egos Peter Parker and Harry Osborn.
Literature
- The Bridge on the Drina: Two young men studying at the Vienna university and coming back to Višegrad for summer vacation, although fierce opponents in political debates (one is a nationalist and the other a socialist), are still best friends. Soon, their complexes and the desire to prove each other wrong turn into petty vendetta, and one of them steals the other's girl. This leads them to passionately hate each other.
- Harry Potter: Harry's mother used to be close friends with Severus Snape when they were children; he had an obvious crush on her (although no one but Dumbledore seemed to know), and a deep and abiding hatred for his then-rival, James Potter. Lily Evans initially didn't like James for being arrogant. However, her friendship with Severus was gradually breaking apart before it finally broke when Severus whipped out the Fantastic Racism card on her after she tried to interfere with him and his rival. She ended up dating the now less hot-headed James, whom she eventually married and had a son, Harry with. Also, since said son reminds Snape of his father, you've got some serious hostility there.
- Hercule Poirot: "Wasp's Nest" has a complicated version: A woman left her man for another, but then went back. The rebound was determined to get revenge, and having learned he had cancer, decided to commit suicide in a way that implicated the first man as posthumous revenge. Fortunately Poirot figured it out early and managed to swap out the poison for harmless powder.
- The Valley of Fear: It is likely that Baldwin's particular vendetta against McMurdo wouldn't be of the "pursue him across continents" strength if he hadn't stolen Baldwin's girl (well, "been a better and more moral person", but Baldwin's not the type to see it that way).
- The Vampire Diaries Universe: In regards to Qetsiyah and Silas' lover. It was taken to extreme levels since Qetsiyah ended up killing Silas' true love out of anger and jealousy.
Live-Action TV
- Buffy the Vampire Slayer: Tension over Drusilla's affections is the main source of the feud between Angel and Spike for much of the second season, even leading to Spike helping Buffy at the end of the season in the hope he'll get Drusilla back. Ironically, Spike himself ends up romantically entangled with Angel's love interest, Buffy, in later seasons. These guys have VERY similar tastes in women.
- Greek: Cappie's carelessness and jealousy lead him to beat up his best friend and roommate Evan for taking Casey to a formal when he failed to show. This leads to the pairing of Casey and Evan at the beginning of the series and the bitter rivalry between Evan and Cappie's respective fraternities ever since.
- Smallville: Lex and Lana are an item for a time, resulting in upped tensions between Clark and Lex.
Video Games
- Onmyōji (2016): Shuten-dōji is mad at Seimei for apparently having seduced his unrequited Love Interest Momiji, much to the dismay of the totally innocent Seimei who a/ doesn't remember a single shit he has done in the past, and b/ truly did briefly met Momiji before, but did not seduce her. The one having done that was someone looking similar to him, who is also a Literal Split Personality of himself.
Visual Novels
- Phoenix Wright: Ace Attorney: One of the cases involves a couple of dueling celebrities (one of which is a Jerkass and the other plain evil) and when the current fiancé (the Jerkass) found out that he had essentially gotten his rival's leftovers, he immediately called off their engagement. The rival had told him this just because he knew it would make his rival angry and this only escalated the rivalry between the two of them. The woman in the meantime? Tired of being a Butt-Monkey, she kills herself.
- School Days: Makoto starts out interested in Kotonoha, gets help from Sekai, and later falls for her, then goes back to Kotonoha at the end after he suspects everyone ditched him due to his lecherous ways by sleeping around with all the girls in the series, and Sekai's declaration that she's pregnant. He gets knifed to death by a jealous Sekai, who in turn gets killed by Kotonoha at the end. When you're in a Psychotic Love Triangle, it's not going to end well.
Webcomics
- Misfile: Missi and Emily, to the point where Ash tells both of them to bug off until they can be decent to each other.
- Hetalia: Axis Powers: Turkey and Greece were already on bad terms long beforehand, but them both liking Japan does not help one bit. According to France in the Christmas 2007 strips, it's bad enough that Japan spends most of his time with the two trying (vainly) to get them to be at least civil to each other.
Web Video
- Dr. Horrible's Sing-Along Blog: The Love Interest is Wide-Eyed Idealist Penny, the opposites, in this case, are the Villain Protagonist Dr. Horrible and the Hero Antagonist Captain Hammer; Captain Hammer is far more into how much it torments Horrible than he is actually interested in Penny. When the Captain rubs it in explicitly and gloats about taking her just because Horrible wants her, the revelation pushes him past I Want My Beloved to Be Happy and convinces Dr Horrible to Murder the Hypotenuse. He argues to himself (in song) that Murder Is the Best Solution both to claim his love from a man who is only using her and to simultaneously prove he's a real villain worthy of respect and fear. She dies instead, leading to Dr. Horrible being inducted into the Evil League of Evil, his major goal throughout the story.
Western Animation
- Futurama: LaBarbara Conrad has been married to both Hermes Conrad and his limboing opponent, Barbados Slim. In this case, they are opposites mostly in terms of Conrad being a short, chubby bureaucrat and Slim being an "ebony adonis" professional athlete (though Hermes is usually the more talented one in their common sport of limbo).
- Total Drama World Tour: Duncan leaves Courtney (a known stickler for the rules) for Gwen (a free-spirited goth girl), which is made worse by the fact that Courtney and Gwen had become friends by that point in the series. Courtney gets pretty heavily into the vendetta part, while Gwen feels guilty but likes the thrill of being with Duncan more. Courtney and Gwen eventually bury the hatchet; Duncan, on the other hand, destroys his relationships with both girls thanks to his fragile ego.
- El Tigre: The Adventures of Manny Rivera: Word of God states that in their teenage years, Manny would date Zoe Aves, and Frida would date Django of the Dead. Both relationships would fail, leaving Manny and Frida together and Zoe and Django getting into a relationship to spite them both. The latter two would eventually develop genuine feelings for each other.
- Winx Club: Musa develops a crush on Riven, one of Red Fountain's specialists soon after they meet in the third episode. Initially, he is interested but not enough to stop pursuing other girls, such as Bloom. Some episodes later and due to a misunderstanding, Riven is aided and falls in love with Darcy. Where Musa is a hot-headed, stubborn, and kind fairy, Darcy is a manipulative, cool-tempered, and cruel witch. When Musa catches wind of Darcy and Riven's booming romance, her already overall rivalry with the Trix (the trio of witches who oppose the Winx), this revelation makes it become personal between the two girls.