Hmm
Dude, let's think about this for a second. Everyone is ignoring what is a little obvious from the info you got there. Girl does NOT want to go with you, you go anyways. She gets "mad" and says you cheated on her. You played it off pretty nice and all, but now you're wondering if you should call her or if she should call you. This means, she's NOT calling you at the moment.
Her friend has very little motive against you since you hardly know her. Hmmm.. Have you ever thought of the possibility that she may be losing interest in you? A lot of girls make **** like this up just to have a "LEGIT" reason to leave a guy. Even the slight speculation of whatever happened is great for her because she might make her self feel better about it ("oh, the creep probably did cheat anyways), and she can have a solid reason for letting you go and dodge telling you that she is just plain not all that interested anymore.
Now you need to be really honest with your self, and figure out if this is what's happening. It shouldn't be too hard, this of her body language and attitude a little prior to this, it probably changed just a tiny bit and deep down you might have wondered what is wrong and your gut was telling you something. If this is the case, you might just want to let it go.
If not, you could actually call her and tell her the facts "hey, look hon, I didn't cheat on you and I got 5 people that were with me to prove it. Either your friend is a lier, or you're just making this stuff up to find your self a reason to hold something against me. If the lader is the case, then just don't bother calling me anymore, you could have picked an easier way out. If your friend really told you this and you actually believe her, you're more then welcome to ask my friends what happened if you really choose so".. or something of that sort anyways, but yeah, doens't sound good to me. good luck bro..
