"You're the one who needs answers, I'm fine just knowing that I can't be around you." One of my favorites.
"You do know that this has nothing to do with you, right?" Really, then if I'm so great what's the issue?
"The only thing we have in common right now is sex and you can get that anywhere."
When he first told me he wanted to leave I asked him if he thought there was anything good about me he said "You're good in bed and gorgeous." Uh, thanks? It's good to know I'm good for something.
"You literally make my skin crawl, it itches every time you're near me." Actually, I think that's called dry skin. They sell lotion for that.