A very melancholy “will they or won't they” book about two people dipping in and out of each other's lives. It could have been very frustrating, since a lot of their issues boil down to miscommunication but I think the author pulled off the reasons for their breakups really well.
I do like that the ending is ambiguous, I don't think I could have been satisfied if they did end up together with a fairytale happy ending. If anything I would have been fine with an ending where they don't end up staying together at all (seems more realistic).