Dude, Candiz has a point. You guys who are, in effect saying, "I wouldn't care if my bitch left" are lying.
A) If you cared about the girl, it would positivly mind fuck you
or
B) If it didn't, that means you are in a relationship with someone you shouldn't be. But even so, as a dude it would mess with your head a little. If it doesn't, then you are a sociopath.