You know, I've been through the same thing. I was in relationships that ended the same way - them dropping off the face of the earth. They didn't even have the guts to tell me it's over!

But then I realized that the common denominator was me. I keep attracting emotionally unavailable men, and the only way to change was to change me. And having been on my own for a while, I realize what I need to do and what I really want out of someone.

He is out there. In the meantime, you need to be patient and get over your loss. Give yourself a break, don't beat yourself up about it, and mourn it's passing.
I'm really sorry this happened to you.