From reading your post, it doesn't sound like you are SUPER frustrated by what your room mate is doing, which will make confronting him easier for the both of you. You probably know very well that adding angry emotions into the equation would only make things worse.
Let him know that he hasn't done anything wrong, but you would like some space. I don't know your room mate, but I have a good feeling he has no idea what he's doing is bothering you. If you confront him in an neutral, clear, and respectful way, I think it would end your problem and perhaps strenthen your relationship with him.
