Friend? Normal Friend? Stranger? I really don't get it.

So many days past by, day after day and the wound finally become a scar. No feeling now. Though that still can be friend, but it's hard cause seems like we both don't have the same topic. Whenever I stat a topic, what he answer is just feel like wanna end the topic as soon as possible. After tired finding topic, I just silent when i see him. So what? I did wrong? He started to walk further and further from my friends list. Ya actually still wan him to be my friend my what if people don't feel like that?
He comes talk with me, I don't know how to answer and every time give a stupid answer, I really don't know what he asking and what type of answer can satisfy him. He is such a genius and I don't dare share too much things with him, cause feels like he will just pick the useful point and dump all the useless suggestion.
Nowadays his friends and him were really interested in discussing about a game call "Dota". Yap i played that game and the time I play maybe longer than everyone of them, but I just don't like them so interested with it. For me it's just a game, after I played it I'll just forget about it and don't know how to discuss with them...
So I said we both really don't have any topic that we both got interested with. When facebook, I'll see how he comment on his senior and friends post compare to mine, very obvious that he still want to continue the comment with his senior/ friends and some time skipped mine or just left an answer "donno". So a "friend" without chatting is really a friend? sometimes I smile to him, he replied me a cool smile, just like a Chinese idioms "Skin smiled but the muscle or meat never smile"
Actually I want ask that "friend" are you really think that I'm your friend? But i know the answer will be "yes" and i knew that, that won't be a sincere answer. Honestly I just don't want to make the condition worse and I know the answer in his heart actually. He is just same with me, a friend even is a fake friend is always better than an enemy. So, how you think about the answer in his heart?