I'm having a friend problem and really need advice (save me a black eye, folks)?

One of my best friends is a girl; her boyfriend seems to be the jealous type and even though we once hit it off on good terms, he hates my guts now because I'm tight with his girlfriend. There is absolutely NOTHING between me and her, and I've known her longer than she has known her boyfriend, but now I have to watch my back and my truck when I'm in town because he's given me an ultimatum and will probably jump me when I'm not paying attention. Hey, I get along with everybody and I'm not about to freak out over one upset boyfriend I hardly ever see; I probably WON'T keep an eye out for him too extremely because I've got my own stuff to do. I've decided not to tell his girlfriend about this situation; it would make matters worse, and I can handle it myself. He knows that me and her talk regularly in school, and he's made specific references that show me he gets worked up over anything she tells him that has to do with me. She has told me stories about him that only strengthen my belief that he is jealous. He told me to stay away from her, which I'm NOT going to do, but at the same time I need to start doing something different and I could use input. There is a high school dance coming up and he's going to be there---I have a date and hopefully when he sees me with her it'll help diffuse this mess.I'm having a friend problem and really need advice (save me a black eye, folks)?
well first don't show fear around the guy.tell your friend, that is a girl, that he is a a hater and ask her why are you going out with a guy that hates me....tell her to stick up for you. if she is really your friend she should understand.I'm having a friend problem and really need advice (save me a black eye, folks)?
If the dance doesn't do it, you need to stop communication all together, until she dumps him. You have no idea what this guy is capable of, and it could turn on her. When she ask why your not contacting her any more let her know, don't lie about it, that could cause problems between your friendship. Keep contact through e-mails if nothing else. Sure you can handle your self, but can she? This guy is possessive and can and will hurt her at some given point and time. So tell her to be extremely careful with this guy, and then let it go.