From what I can understand from your post, it appears that you think he has a thing for you and that explains his behavior. Since you insist he isn't a perv (at least I think that's what you meant) then perhaps he too senses that you have mistaken his good will as something more and it makes him feel uncomfortable.

Why aren't his explanations of the situation logical to you? You seem to be fixated with the single idea that he has a crush on you and that there is no other explanation. There are many.

IF you feel he is acting inappropriately DO discuss this with the appropriate people at your school and your parents. It really doesn't sound like the case based upon the information that you've stated, it sounds very much like you've freaked him out and he's doing what he can to avoid you.

What I'm reading between the lines is that when you discussed this with "big people" they brought the problem to his attention (perhaps hypothetically). If he has any intelligence at all, he's discussed this with his superiors to let them know there is a potential problem that they should be aware of.

My advice is treat him just as you would any other teacher, don't expect any more or any less.