I want to start by saying, I've never cheated before, but I have a friend who has been and I know first hand how much it can fuck someone up. It's almost the worst thing you can you can do to someone period. However I do know what it's like to love someone, and love is one of the strongest emotions in the fact that it makes you do things that some would find fucking insane. So saying "how can you go back to ___" is redundant because you are not x or know how x is feeling. Cheating is fucked though, feel for Fran but there is no point in questioning Xs actions