I feel like I'm loosing my best friend? please help.?

Ok so my best friend and I had some pretty big problems in the past, but a couple months ago we found out who's fault it was and all that so we made up. I haven't talked to him since school ended. Whenever I send him a text, he doesn't respond, or if I chat him on Facebook, he logs off immediately (or goes offline, I can't tell). I don't know why at all, I don't think I did anything. He's really popular and I'm not, so I know I brought his reputation down a little, but still, I can't remember doing anything to him. I really feel like he doesn't want to talk to me and I'm really getting upset. What should I do? I won't see him until the beginning of school if we don't talk electronically. Please help! Thanks for all of the answers in advance.