so your g/f is going to get drunk around a bunch of guys and leave you at home, and she started a fight about nothing with you. hate to break it to you dude but she's either psycho or she's cheating on you. next step is before the kegger, she's going to say "I think it's best that we just be friends" or "I think we need a break from each other". let me translate for you, first one is she's just going to make a booty call to some one that she's been trying to hook up with, second one is she's been hooking up with some dude and this is her way of making sure she's justified if you catch her. good luck with that.