Hmmm....this ought to be interesting....
1. "I think I'm in love with [insert name of homeless fat girl here]."
2. "I can't handle a committment right now." --hey, at least he was honest!
3. "I'm not sure about a future with you" spoken in a bar 3 hours away from my home, followed up by a call to say "I didn't mean it, let's talk", a week of silence, and then an email saying "Oops. Yep. I meant that after all. Sorry." (And this dude and I LIVED together. He had gone off for a 3 month internship!!)
OK....lines that I have used....
I think my trademark one was usually "I don't want to be in a relationship right now" [Meaning I don't want to be in a relationship with YOU, but that sounds soo mean!]
And the guy with whom I was in the same situation as Legally Brunette is now: I don't think we should be together anymore.
But those are relationships though.....if we're talking casual dating...I just stop taking their calls.