I found guys are similar...when they dont want to talk to you, they just disappear. Women can't understand them...
When I was in China, I had a bf in USA. We kept in touch quite often. But suddenly he didn't reply my email or answer calls. I even didn't know he was alive or not. Finally he emailed me an odd excuse and didnt contact me anymore.
Now I am smarter since I no more care of them. I know it's hard for you. But you have to be ready for seperating from him. Dont miss a good man if you see one.