This ex appears not as a person, but as a scar. They are mentioned in hushed tones: “My last relationship broke me.” Their function is pure exposition—to explain why the protagonist has trust issues, commitment phobia, or a locked diary. This EXE never needs to show up on page. They are the reason the current love interest has to work twice as hard.
In the pantheon of romantic tropes, few are as divisive—or as deliciously painful—as the EXE relationship. The ex, the former flame, the "one who got away" (or the one you fled from). In romantic storylines, the EXE is rarely just a background character. They are a ghost at the feast, a mirror held up to the protagonist’s flaws, and often the most dangerous obstacle to a "happily ever after." SEX exe - SEX
If the answer is “nothing,” the ex is just a plot device. But if the answer is “how to love better next time”—then that ex, whether they return or not, has done their job. And that is why, for all the pain they bring, the EXE remains one of the most enduring figures in romantic fiction. They are the ghost we can’t help but invite back, just to see if this time, the story ends differently. This ex appears not as a person, but as a scar