I miss my bestfriend, and i don't know what happened between us...?

Sometimes, its not your fault , but the other person. I mean maybe he is going through tough times in his life and just doesn't want to reveal it. Just try to be there for him . Since you've been friends for so long, he probably knows that. But just show him that no matter what, you are there. Also he might be trying to be more independent, and wants to have more space. Whatever it is, try to talk about it, and wish you the best of luck! oh yea...your English was just fine. :P