Boys: One of life's great mysteries

You know what's weird? When a boy you had one date with over a year ago IMs you out of nowhere and asks you if you want to go out sometime. Then you ponder and think, "Well, you know, he was a relationship guy, and I wasn't looking for a relationship then but I am now, I think, and he was cute and a lot of fun, so why the hell not?" So you accept his offer, and then he tells you he's leaving town for a week or two or something like that, but he'll be in touch when he returns. And like, two months later, you still haven't heard from him. WTF?