I hope her name is on the lease and not yours, that way you can bail. If you still have to live together after breaking up, that sucks dude. Though cats are awesome. Also, first. I've never been first before. It's nice.

You didn't say that it was a new appartment the two of you got together - I hope for your sake it's not. And I have to assume those of you who agree with the girlfriend's choice have never actually been in love with a human being. Don't get me wrong, I'd never abandon my cat for my girlfriend, but I wouldn't abandon my girlfriend for my cat either. I would find a way to arrange my life that allows for both of them. If he had told her "it's me or the cat" that would be different- I'm assuming he didn't say that because people on FML don't seem to be shy about that sort of thing. I've seen "Today, I told my [significant other] that either [pet / car / roommate / other] goes or I go. They chose the [pet / car / roommate / other]. FML" a couple of times.