Ok, here's the situation. My girlfriend's best friend made a comment to a buddy of mine a couple weeks ago about how he had been an ass to a good friend of hers about a year back. I guess he had disrespected the girl or something, yada yada yada. Anyway, my gf and I are supposed to go out for this guy's 26th b-day on Saturday with a bunch of people downtown. My gf is best friends with this girl so naturally she asked her to go with us. Well, I told my girlfriend that my buddy didn't want her friend to go because he would feel uncomfortable. So now my girl is a little upset about the whole situation. She thinks the guy is just being immature about it and he needs to get over it. I really want to go out with the guy and my buddies, but I don't want to piss my gf off. I also don't want to say "yeah, I guess your friend can come" since it's the guy's birthday and I don't want to piss him off either. What do I do about everything?