One of the symptoms of schizophrenia is to isolate. So he probably throws off that whole feeling like he wants you to go away. But, I say that you stay friends with him. Just study up on schizophrenia and remember that you can't fix him or argue him out of his delusions (if he has them,) but to just be his friend and listen, (but don't play along with his delusions, either.) And when he needs it to give him space. In the long run he'll be better off having a friend around and so will you.