we don't truly appreciate what we have until it's gone

— horrible ex-fiance only regrets his decision when fl takes over ogfl's body and he falls in love with her.

— ex-fiance used fl for her money and power regrets neglecting her after she tries to break off their engagement.

— ml only starts to regret neglecting fl after fl tries to break their engagement because of a precognition, however I think they both regressed.

— fl moves on from her former crush and close friend, the close friend only regrets not getting with fl when she's finally moved on.

— trashy step family use fl for money and power, only regret their decision when fl finds out and marries in to another family.

— in og-timeline ex-fiance cheats on fl with her best friend, in current timeline the best friend still tries to cheat with the fiance who regrets mistreating fl.

— husband suddenly doesn't hate fl now that there's a new person in her body, he regrets hating fl so publicly as she divorces him.

— fiance regrets neglecting fl when she starts acting nonchalant and uninterested in him.

— barely regrets mistreating and abusing fl after her multiple suicide attempts (he's so awful).

— original ml's are under a supposed spell so they will eventually regret mistreating fl, currently they just barely regret it.