NEWAYS, back to the woman situation. theres 2 ways to handle this.
1) if you're confident that ur girl really likes you then who cares if dudes hit on her. hell, let them buy her a drink n some shit, less money ur using. as long as you know that she's going home w/ u in the end of the night then its all good.
2) if you're with ur girl and she's not liking that guys/guy is hittin on her, then this is the ONLY time you should step in. tell him to fuck off, etc...
Now, if ur with a girl and she's diggin the guy hittin on her then SHE ISN'T UR GIRL. Dont get mad at the guy, get mad at urself that you just brought some girl out who didn't really care where she got her dick. So go home, up ur game, and head back out.
-Paul