YOU cannot do anything. IF he doesn't like you he doesn't like you. You cannot force anyone to like you this goes for girls and guys. If he says no then leave him ALONE. Or you're just an annoyance.
well. he either doesn't like you, or has a really good reason for saying no. im sorry but u should let him be. im usually really aleatório 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.