I have to agree with H3rmit too! If this is how he behaves when times are tough (and he calls THIS tough???) then Lord only knows what will happen when he's faced with a REAL crisis!
Dearheart, this guy is unstable, big time. I don't know if he needs therapy, or what, but you really DID dodge the bullet. I know you're hurting right now, but in the long run you WILL be glad this happened when it did!

If you had been married, and he had taken off, you'd be in a world of hurt with all the bills, etc., left for YOU to take care of.
You need to just move on. The hurt will subside in time. Keep yourself busy, go out with friends, and have a good time. Don't sit home grieving for this guy because he just isn't worth it. He certainly didn't take YOUR feeling into account when he left!
I wish you the very best, my friend. Please take care of you -- and God bless. Hugs, Lee