It's Complicated: It's not you, it's me... Breaking up is hard to do!!

Breaking up is hard to do... so what's your worst break up story?

My girlfriends are hard on me because I'm famous for the " It's not you, it's me" line. Even worse, I'm the kind of girl that doesn't feel that I need to tell you why I don't want to see you anymore if it's under five dates. I feel that five dates and under is a "trying on period". If I don't feel it fits, I'll return it without needing a reason beyond " It's not you, it's me". Horrible right... but I'm working on it- I promise.

So tell me, what is your worst break up story, either as the giver or the receiver?
Do you have a break up line you stick to?