It’s kind of a buy one get one free situation because you get the first romance as well as the second one of them falling back in love with each other. You were so passionate you ended it with someone and yet you found your way back and decided that the love was worth working through your pain?? Are you kidding me?? notable example: you deserve each other by Sarah Hogle.
fav niche trope tho is the epistolary romance… fall in love w me via prolonged email exchange please