well, being the guy that was left for another guy on most occasions, i would say: "stay honest". tell her whats up and that you know shes got a friend.
just dont get a touch at her behind her boyfriends back. i would be a lot happier right now if other guys did the same back then.
and now......... i am going to hit chads with 51 mph to kill myself. too bad noone knows the path guarded by hobbits adn dragons to it
no serious: stay honest to you, to her and to him