I didn't actually see the fucking but it was obvious what was going on. Basically I was in shock and just left. It was for the best, I found out later that the other dude had no idea about me. I later called the bitch and called her a bunch of names, ect. I actually got to know the other guy a little. We both told her to fuck off at about the same time. Then her best friend found out about all of this and called her a whore and told her to fuck off.