Hey, Rust, man...doesn't sound good. I'm not saying she is 100% guilty, but that is uncool.
I think the part that is scary is you don't know her friends. My wife and I know all of each other's friends. I talk about my wife all of the time, anyway. If she doesn't want you to be around her friends there is a problem unless it is some sort of exclusive hen's night or something. To all of our friends, on either side, it is me and my wife or vice versa. It is never just me or just her.
As for male friends, it is possible for them to exist, but most of the ones that don't want to bone her are good friends with me also. I have some friends that are female that I have no intention of ****ing. It is possible, but if your girl isn't willing to include you, there are problems, not necessarily cheating, but problems with the relationship.
I think the best thing to do is be open, honest, and explicit with your concerns. She may get pissed, but at some point during the relationship you will have to communicate. If you can't do it now, whether or not she is cheating, there will be problems later.
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