Why are her friends acting like this-am I the bad guy?

Sorry to here that. Look, everybody screws up. You lied, yes that was wrong, but it's not bad enough for her friends to keep you away from her. It's not like you cheated on her. If I was you, I would confront her even if her friends are there trying to avoid you. Confront her and tell her how you feel, if it doesn't work the first time, don't give up, eventually they will give in! If you don't wanna do this you can always follow her and her friends till she is alone. Best of luck and I hope everything works out