he likes me..and she is mad at me...

Well its a bit of a love triangle... if i were you i would tell him that i can't go out with him... but i wouldnt tell him the reason; to make ur best friend happy, but chances are that he wont go for her either since if he goes for ur friend u might tell her that he asked u out, therefor he is an ass and he will get dumped... so becuz of him looking an ass he wont go... i dunno if you can understand what i just said... but i hope you do...

just dont get selfish... if he really likes you he might wait till ur friends crush on him passes... if not... u never really had him

hope i helped ... c ya