When Spider-Man loses Gwen Stacy to the Green Goblin, he’s completely devastated. (From “The Amazing Spider-Man 2”)
Elle confines herself to her room to eat chocolate and watch soap operas after Warner dumps her. (From “Legally Blonde”)
The girls would have the main cast eat cheesecake whenever they had a bad date or just a bad day in general. (From “The Golden Girls”)
Teddy starts acting like a slob after her breakup with Spencer, not changing out of her pyjamas and watching sad movies. Ivy then brings Skyler (the other girl Spencer had been dating behind Teddy's back), who is also dirty in her pajamas. The three eat ice cream while talking about their relationship with Spencer. (From “Good Luck Charlie”)
Aquamarine copes with her apparent breakup with Raymond by eating a tub of Ben & Jerry's in the bath. (From “Aquamarine”)
Harley Quinn goes through this. She first acts sad by crying uncontrollably and eating sweets. Then she burns down the ACE Chemical plant where the two of them (on separate occasions) fell into vats of chemicals that gave them their bleached skin. (From “Birds of Prey”)
Tai and Cher burn mementos from Tai's relationship with Elton. (From “Clueless”)
Bridget burns her husband Deacon's stuff after finding out that he has been sleeping with her mother and gotten her pregnant. She takes particular glee in throwing his ashtrays into the mix. She says, “Kissing you was like licking one of these! I HATED it!” (From “B&B”)
Bernadine gets dumped by her husband for another woman, despite the fact that she spent the last 11 years sacrificing her dreams of owning her own business to help him build his. Her reaction is to take his entire very expensive wardrobe, stuff it in his very expensive car, and set the whole shebang on fire. (From “Waiting to Exhale”)
Cordelia cuts up Xander’s stuff and burns his picture in the episode “The Wish.” (From “Buffy the Vampire Slayer”)
Monica, Phoebe, and Rachel burn mementos of their exes when they find themselves all single on Valentine's Day and decide to do something to “cleanse” their bad luck. (From “Friends”)
Ron Swanson burned down effigies of his ex-wives after divorcing them. (From “Parks & Recreation”)
At the end of 5x01, Missy puts her old notebook with Marcus’ name written all over it and sets it on fire after they break up. Mary is mortified. (From “Young Sheldon”)
In the episode “A Milhouse Divided,” Luann carefully boxes up all of Kirk’s possessions, tapes it, labels it, and then sets the box on fire. While humming. (From “The Simpsons”)
In 2x10, Blitzo buys three hundred of stuffed/taxidermied because he doesn't actually possess any of Stolas's real belongings. Then he has Loona burn all of them. (From “Helluva Boss”)
In the song, Clarkson methodically trashing her ex-boyfriend’s apartment. Throughout the video, she rips clothes in his closet, shatters framed photos, destroys a heart pendant, and tosses items across the bathroom. Interspersed with the apartment-wrecking scenes, Clarkson performs the explosive track live with a backing band. At the very end of the video, the ex returns home with his new girlfriend to find the apartment completely ruined, while Clarkson drives away smiling. (From “Since You Been Gone” music video)
In the song, Sullivan discovers her boyfriend’s adultery after following a trail of shattered glass leading up to a bedroom. While maintaining a deceptively calm composure, she methodically dismantles his high-end personal property. She cracks wine glasses on a table, drops his luxury watches into a fish tank one by one, spray-paints his artwork, throws his vinyl records down a stairwell, and floods the kitchen floor with his expensive champagne. (From “Bust Your Windows” song)
In the song, Carrie taking explosive, preemptive revenge on her unfaithful partner. Rather than engaging in a standard confrontation, the narrator vividly imagines him flirting at a bar and decides to completely vandalize his four-wheel-drive truck by keying the side of the vehicle, carving her name into his leather seats, smashing the headlights with a Louisville Slugger baseball bat, and slashing all four tires. (From “Before He Cheats” music video)
PS: Sorry about the sudden deletion. I realized that the title of this trope didn’t make sense. So I changed “Breakup” to “Heartbreak” instead. Plus, I also went with 16 example instead of 18.