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He may genuinely be distressed over other events or he may have met someone else who he wants to pursue. Sometimes, people will act like this hoping to antagonize you into initiating a break up so that they don't need to deal with the guilt of breaking up with you.
Tell him you won't bother him again and you will wait for him to call when he wants to see you, but if you don't hear from him in the next 2 weeks, you will assume that he does not want to be together with you any more. I would bet that you won't hear from him.