Awww, sweetie...This sucks...I don't think it was the booty call that made him disappear...Guys disappear constantly for tons of reasons -- they decide they're not into it, they meet someone else, they freak out about getting close....It's happened to me a lot...
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It could be a million things, so don't beat yourself up...The truth is, if he really liked you a lot, one late night call followed by some sex isn't going to keep him away.....
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I say drop him one more email, just saying that you'd love to see him again if he's up for it, and apologizing if you did anything wrong...Keep it short, non-pressuring, non-whiney, etc...
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If you don't hear back from him, move on...A guy who can't even be straight about why he doesn't want to see you anymore is not worth wasting time over.....

Damn I have no idea, men are crazy? Maybe he's really busy at work, I think us girls are really impatient. Was the sex ok? MAybe he's pissed cos he thinks that you're treating him as a booty call instead of as a potential suitor? I'd love to hear Raven's opinion on this one, he seems to have an in depth knowledge of the crazy man's psyche....