I broke up with my first girlfriend because she was violent.
I "broke up" with my last boyfriend because he was too much of a coward to break-up with me. :D
first one, she was insanely jealous, second one, she was having sex with another, third, was having sex with my brother, and forth, now that I've got used to her weirdness we're staying together.
She was nuts!
lack of communication and not getting along
too possessive, too clingy
He didn't frakin exist.