I guess I should explain a bit better.
Yes, she is in fact my girlfriend, as she told me that I was her boyfriend several times, even going as far as to kiss me, grab my hand, and other such romantic things without any input from me.
The friend is not an ass. He really isn't that bad of a guy, and I know I might have put him in a bad light, but there was reason behind me getting hit. Such as the punch to the stomach wasn't with any bad intentions, just normal messing around for such and such reasons that started with a normal joke, but escalated a little. It's more that he can do it than anything else that is a little unnerving.
The girl really isn't cheating on me or him, as we (me and the best friend) know about each other with her, I just feel a little uncomfortable with having another guy with my girlfriend and want some extra input from a third party.
And another thing I forgot to bring up but no one asked, it really isn't that serious, and I have no intentions of making it so, I just want to be able to get out of it without any of my friends, or me, feeling hurt.
Once again, thanks for any input from you guys, you've become almost like another family to me over the past few months I've been here, and it's good knowing you guys will actually talk to me, and others in the community, about problems they are having.