This is a really insane guy. I won an item, he decided not to honor the sale, cancel the order and re-list it for a higher price (blatant violation of ebay terms). I reported him to ebay and moved on. Dude keeps threatening me over messages for no apparent reason, left positive feedback with flat out lies and nasty comments on my profile, and just won't let this go. I'm not even sure why he's so mad, because I was the one that got screwed out of the item.

Some people are just unstable, and you should avoid them as much as you can. This is one of those instances.