I think you are just wasting too much time and energy on someone who isn't worth it. You were disappointed but there is no reason to indulge in feeling sorry for yourself nor in figuring the guy out - let this experience just be one blip on your radar screen as it passes by. Move on. As the saying (sort of) goes: "Don't let assholes live rent-free in your head." His antics don't have anything to do with you, so whenever you find yourself again pondering what happened, distract yourself with something else, get occupied with a task, etc. You have better things to do!
The world opens up... when you do.
Oh, oh, can't you see? Love is the drug for me. ~Bryan Ferry
"Love is that condition in which another person's happiness is essential to your own." ~Robert Heinlein