Well I would't have dumped you, if you could fix my car and I couldn't, but if you could fix my car, but wouldn't.....thems grounds for seeing other people.
I remember getting dumped in high school by a girl I didn't know I was dating. Apparently my friends had this thing where they would ask out girls on my behalf, so this wasn't a one-time experience.
Once dumped a girl because she wouldn't pretend to like wrestling or hockey, but expected me to watch Big Brother and Top Model and shit shows like that.