I think the only way you are ever going to really get the answers you want is to ask him.
I however, have been there.
Five years ago. Sad story and I don't want to make you feel any worse so I'll say the positives.
When I hadn't heard from him after six months, I decided to move on. Three years later, I met my now partner (of two years at the end of this month) and I never ever heard from the other guy again.
So I like to think, if it's meant to be, it's meant to be and it wasn't and I have found someone who I am meant to be with.

But I do not want you to be the one left hanging like I was and you need to ask him.