あなた cannot do anything. IF he doesn't like あなた he doesn't like you. あなた cannot force anyone to like あなた this goes for girls and guys. If he says no then leave him ALONE. または you're just an annoyance.
well. he either doesn't like you, または has a really good reason for saying no. im sorry but u should let him be. im usually really ランダム when i answer questions, but im sad 4 u. these people always get me out of any bad mood tho! it might help at least....sorry.