Dont know what to do!?!?

I cant stop thinking about him. he's been my bff since we were 6. but everything i do, every where i go, i think of him. And it's not just that, it's like I look at his picture all the time, and I have dreams where he's just talking to me, or sitting there. And whenever I think about him, my stomach flips and I feel scared. But he dated my other friend for 2 weeks. he really liked her, but she broke up with him. Now he talks to me even MORE and the other day he ran with me the whole P.E. cl. It made me feel good too, b/c i'm a slow runner b/c I have cerebral palsy but he said it doesn't matter to him . And we're going to a concert together in 2 weeks, with his brother and his brother's friend Lizzie. And we danced twice at our first school dance, and he asked me! Anyway, I just think about him ALL THE TIME now. It's weird. And I made a movie (my hobbie) and I sent it to him and I thought it he would think it was boring but he said it was awesome! but am i just some old friend?