Trusting your girlfriends "guy friends"

Pants
I love my girlfriend and trust her completely. It's the guy friends I don't trust. I have had every girlfriend I've been with cheat with me so far. I have let my girlfriend know that I have trust issues, she has been very accommodating being very open and honest. I know that she has guy friends, its only natural. I also have girl friends, also natural. I have met most of her guy friends and trust them because she has known them for years. What makes me mad is that she won't hear from a guy for months or a year and then he pops his head in the picture. That or it's a guy from nowhere on the radar that just shows up saying he got her number from a friend. She says that he is an old friend or just a nice guy from one of her classes and isn't interested in her that way. As a guy I know why this cat is sticking his head back in the picture or showing up in the first place. More often than not I turn out to be right and she tells the guy to leave her alone she is in a relationship with me and very committed. The problem is that it never seems to stop. There is always some guy who somehow gets her number threw a friend and starts calling her. Is she simply naive to all these guys intentions or does she simply like the attention. I know she loves me, hasn't cheated on me and never would. She doesn't understand that it's not her I don't trust it's these guys I never met. She is a very pretty girl. Have any other guys dealt with this, if so how? I don't trust anyone I don't meet how can she except me to also. I am starting to ramble now I just need some advice. Thanks in advance!
Trusting your girlfriends "guy friends"
6 Opinion