Really sorry this happened to you! Lots of difference from age 13 though (you couldn't be held against your will and knew how to fight and didn't have to have any problems with being believed/who to tell, etc.). It was bad behavior by the guy, not you. In addition to Peanuts' "following the keys" I would talk to more people during the night and mingle a bit more instead of concentrating on one person. I still remember when my girlfriend and I would go out; she was a physical education teacher and had had the police come talk to her classes (self defense training) and the police had taught the classes/girls to always make friends with the bartender! Then if there is a problem the bartender will often help (get the bouncer to help, etc.).

I would "cuss out" your coworker for abandoning you also without even saying good night? Not a very good "friend" it doesn't sound like.