Thanks for all your replies, they have been really helpful and well balanced.
I have just spent 5 wonderful days with my GF. I did indeed talk to her about it, and the talk was really good. Im really happy in the fact that we have a really good relationship based on communication, i basically told her everything on my mind. I told her that yes i was jealous, and i was hurt. That i didnt want to every dictate who she sees and hangs out with, that sort of thing is just self destructive in a long distance relationship.
When she spoke she was very persuasive, and also really understanding. Told me i had absolutely no grounds whatsoever to feel worried.
This is who she is, she has always had *close* male friends, she doesnt like the bitchyness of female cliques. She merely likes this guy as a friend.
The thing i liked most was, on the night she was hanging out with him(the saturday), she noticed he had the Da Vinci code in English, she knew i wanted to read it, so she borrowed it for me from him....
I feel also that it has made our relationship stronger, and i know that if this prick tries anything, she will tell me the moment he does, and reject him point blank.
She has extremely high morals, is intelligent, mature and has a very strong character.
And i trust her implicitly.
Thanks again guys,
very best