How to talk to him again?

Hey, Okay, I’m gonna try to make this quick. So I there’s this guy and I’ve known him since I was 9. I’ve liked him ever since (I’m 15 now)We were best friends, and had feelings for each other. He made me smile every, single day. We dove into a relationship really young, and it ended so badly. People were making fun of us, and he ended it. I called him, e-mailed him, tried everything and he never told me why. He told his friend that he did it for me because it hurt him to see the way the catty girls were giving me crap. I wrote an insanely long e-mail telling him that him breaking up with me hurt a thousand times more than anything the other girls did. He never replied and never talked to me again. I tried so hard to talk to him, say hi and be friendly but I felt completely invisible because he ignored me. I never fully understood why we couldn’t have stayed friends. I never got over him. About a year later, we both went to a friend’s Christmas party and we reconnected. We hugged goodbye for the longest time. I even gave him a pooh bear for Christmas. After Christmas, I didn’t have the guts to keep connected so we drifted apart over the school year - that was in 7th grade. (we wave “hi” occasionally, but that’s it) In 8th grade, his friend told me he still liked me but I never had the courage to tell him I felt the same. Now, it’s nearing the end of 9th grade and I’ll be graduating this summer, which means I won’t see him because he’s going to a different high school. No crush I had has ever lasted as long as this and I’m starting to wonder if I’m ever going to get over him. I finally had the guts today to tell him “Happy Birthday”. He smiled and said thanks. Do you think it would be weird to send him a text tomorrow asking if he had a good birthday? or do you think it’s weird that I’m suddenly talking to him after ALL these years of just passing him in the halls. (we haven’t talked in 2 years ) Do you think I should give it another try? How do I summon the courage?

THANKS for helping!