Love story centered on exes

[BWTraveller]

I was just reading a new series about a man who'd never forgotten his ex-wife and just discovered that she's now the mother of his child, and is trying to figure out how to act given the situation, with clear indications that he, at least, regrets past actions and wishes he could try again. This made me wonder if there are any completed works with, similarly, a focus on a couple who'd broken up for one reason or another and one or both are now trying to patch things up and have a second try. Please, only ones where the couple do end up together in the end.