as a girl i like having choices and love it if two guys are trying to get with me because they try to out do eacher and its funny. but if i were you i would be pissed off. if i was trying to hook up with some guy and one of my friends just came over and stole him i'd be very angry and wouldnt talk to her for a long time, but girls tend to be pretty pissy about these things. i think you're right in your anger though.