James,
Unlike my situation, it doesn't sound like she was forced to stay and hang out with you. I definitely think you should call her and tell her honestly why you waited so long and the predicaments that caused it. If she is a nice and mature person, she will understand and honestly, would you want to see someone who is nuerotic enough to get mad at you for not calling right when you got the number. In addition, like I said, a girl would not stay at a bar with a guy she was not interested in alone until late at night if she didn't like you. She had nothing to lose like me i.e. making my house look bad. Besides, if you call her and she is weird about it the chances are you will never have to see or talk to this girl again. So what do you have to lose; you never know what may come about if you do call her...
P.S. Did I really lead him on a lot? I was just trying to be nice and friendly to him. Maybe I did allow it to go to far but this guy. But honestly, he was so chill in the beginning and then on the bus he suddenly started getting "friendly" when everyone else started to hook up. Now, I feel really bad; his house is going to ostrasize my house and me.