My girlfriend of 8 months now, has gone on a vacation with her 2 girlfriends to Jamaica for a week. They do this every year, and last year my girlfriend was single, and didn't hook up with any guys when she was there. Her 2 married friends, however, did. We don't use condoms together, but she had some from before in her jewelery box. I noticed before she left, that she had put one of the condoms in her airplane carry on bag. I didn't say anything to her because I didn't want to start anything before she left. She called my at 6:00 this morning drunk, and sounding overly loving, and guilty to me on the phone. Do you think she is cheating, and how do I address this with her when she gets home?