Love is overrated, because once you start to lose that feeling it just turns into guilt. Why don't you or they feel that way about you anymore? You start to notice the things that you used to like, but they annoy you now. Minimal mistakes piss you off. Why can't they do better? You start to find other people more attractive. What if you were single again? You were happy when you were single, you didn't have to deal with the arguing and the complaining, all the stupid fights about nothing. So you leave. Both hearts broken.
I would rather have not loved at all.