My girlfriend and I have been going out for a month and we really care about each other. There's one snag though. I guess before we started going out she was talking to some other guy and now she calls him her best friend. I have no problem at all with her having guy friends but this one guy makes me feel nervous. She calls him cute, they're making nick-names for each other, she hasn't told me about him, and he calls her cute. I'm feeling pissed off and confused because I don't know what to do or think. I haven't confronted her yet. Should I confront her about it or what? Suggestions?