I say just tell your best friend how you feel, and that you like him.. If she gets mad, tell her you'll back off, and see what happens with the two of them. Maybe he really likes you, and just doesnt want to say so.. Maybe thats why he wouldn't tell you which one it was? Don't sweat over it, and don't lose a friendship with your best friend because of him. I've done that more then enough times, to learn my lesson.. Anyway, hope that was a some help, .