Thank you for sharing your opinions.

Yes, I know there might be other reasons. I have been trying to figure some of them out, but only really bad things come to my mind apart from the most prosaic and obvious ones like family, work and lack of free time. Sometimes it's good not to think too much. I live in a very conservative society where even non-sexual intimacy between two men can be considered gay and stigmatized. I don't care about that, he might be afraid.
Reciprocation in a relationship is something I find very important. But it can't be pushed. I've already told him I miss him and it made me feel bad. I mean I don't think what I said was was bad, just felt like giving too much of a hint like "hi, I'm here and I need your attention". Tried asking him out lately, but I finally gave up leaving it upto him. I told him, that if he had the time and wanted to see me, he should let me know. I'll try again in some time.
I guess I shouldn't overcomplicate it in my thoughts, but in a situation like this my mind is racing.