Chosen I've been in those circumstances myself. It's fine tho, you can let the bastard make a fool of himself. Just watch. Those kind of guys can never get the girl to bed.
If you really want to be a man, hold her from the wrist and ask her for a private conversation and take her somewhere else. She won't refuse you since you ARE her date.
Do what you need to do from there.
I say DO NOT, I REPEAT DO NOT go talk to him and state how you feel. You are not his bitch. Just be a man and do what I told you if something like that ever happens again.
About the girl, ask her out and forget the losers.