Yeah its not only inmovies that women f there BF best mate. Recently heard that is has something to do with the familiarity of friends. So yeah, when you have a gf and you are like"is she flirting with my uncle?" She probably is...
Still, my advice is to cherish your friendship over her hypergamisch nature. Like other posters are saying, she is just attention whoring , but you are twice as weak for choosing quick ***** over a bond with your friend.
I would leave it like this, dont try to follow up on this altercation. Depends how close this friend is, but if he is close to you and is always on stand by to help you out you are ,jmo, obligated to inform him.
At least have enough honour to keep your hands of her. Dont think you can ditch your homie and run to the sun with her , at the core she wont respect you neither.
This is how true bonds between men get tested; by introducing women in the inner circle. Tru caracter comes to the surface when there is pvssy around.