ummm dont hate me for saying this ..but ive meet most of my ex boyfriends from there friends...see i would be dating a guy then i meet his friend and his friends starts taking to me (with out my boyfriend around) he would call or come over (this was befor the myspace age lol)..asking me questions like where i grew up and whats my fav color, small stuff like that,,then befor i know it im braking up with my boyfriend and dating the friend ( this is back in my high school age,,not me know)... and most of the time the guys where best buds, hung out since they was little....im not saying that you frined is trying to move in on your girl,,but it happens...the best bet would be to ask him why he is doing so and if he says he is not let him know that ,thats what it looks like..then ask your girlfriend about it and see how she feels about the friend talking to her......