hey man ive had the same problem sort of.. i mean i dont get PISSED but it does bug me.
see my girl is very social and its great. but shes also not to be bragging very pretty.. so lots of guys try to talk to her and the like..
what i do is just ignore it.. if its just like "hey whats up" kinda thing then dont worry about it.. if shes going out of her way to talk to other guys then ask her about it..
then if shes like oh there just my friend. tell her the thing we all know is true.. guys are guys and there just tryin to get at her.
she'll understand and it should help things out