Should I try to talking to him or move on? [My best friend says he's not interested?]?

I think you hurt his ego and now he's sore at you. Trying to get back at you for what he perceives as your 'rejection.' Maybe you can ask your friend to clear the air between you two or send him a nice message if you can't talk directly- I think its worth a try if you like him so much. Cheer up now :) you'll get him in the end :)