Dating him didn't even come into my head. Jesus, once and for all, I don't go looking for this shit on myspace, I don't sweet talk these guys into complimenting me or hanging out with me, they find me. I understand what everyone is trying to say about the myspace thing. I get that now. I also understand that maybe I am giving off some kind of signal to these guys that I'm not aware of, I'll look into that more.
But I don't want this kind of attention and definately am not looking for it through myspace.
I understand that these guys are making contact with you rather then you seeking them out, but even so, you're responding, which makes them hopeful. Just because some dude hits you up on MySpace doesn't mean you have to respond.
If you get a random friend request or message from a dude on MySpace that you don't know personally, he's either 1.) a friendless freak, or (more likely) 2.) a horny dude looking for ass. When these guys contact you, it's because they did a search of local 18-20 year old females, and they're probably writing "hey hottie, what's up?" messages to several other random chicks at the same time they're messaging you.
This particular guy that you're talking about is an asshole, no doubt. Here's my question for you though...how much contact did you have with him prior to his little outburst? If you seriously had barely spoken with him, he asked you to come over, and then flipped out when you rejected him, then he's psychotic. As someone else suggested, he will end up in jail someday, and he shouldn't be any concern of yours.
However, if you had spoken with him several times, flirted with him a bit (maybe not even intentionally, I'm just talking "LOL'ing" at his jokes), and then he asked you to hang out, well that's a little different. It's absolutely no excuse for him to treat you the way he did, but it makes more sense. I think you just need to keep in mind that dudes who are randomly contacting you via MySpace are 99% of the time looking for some play, and nothing else. If a dude contacts you and says "hey, you're hot, wanna chat?" you don't have to respond.
Dude was probably just pissed that he wasted his time on a dead end, so he lashed out just to make you feel bad about yourself. Like UNDR8D said, he probably wacked off and that night and now has completely forgotten about it. Dudes like this aren't even worth talking to. It will always end the same way...