You do have every right to be upset ive had things like that happen to me just recently, not about my girl lieing about something of her sexual past but she goes to this little club thing with her friends, w.e. i trust her enough and believe she isnt going to do something that she will later regret... but aparently she dances with guys there, you know, harmless dancing and such, well, we were talking and i said, what you dance with other guys or somthing, expecting her to say no, and she said yes. but the way she said it almost sounded like she didnt want to tell me, but she didnt want to have to lie to me about it... but w..e i got over it but ill still always think about it from time to time.