I agree with above...huge huge red flags. By all means, even if it feels wussy, just tell him whatever you need to, to have a nonconfrontational end to it. Then don't look back. Your friend did you a service by telling you about him and if it feels wrong with him, then it IS wrong....if he 'seems' too much, then he IS too much, and the fact is....if he gets weird post sex.....HE IS WEIRD.

Take care of yourself. You deserve better.