I'm in love with a boy that doesn't notice me

I have had feelings for this boy since I was in the 6th grade and I am in the 12 grade now. He is the most talented person I have ever met. I met him in the first musical I was in. I was in the background and never really got to talk to him bc he was a lead. I always had my eyes on him he was cute and kind and an amazing singer. After that I didn't see him again until my freshman year in high school he was one of the leads in the school musical. As soon as he hit the stage I knew it was him I fell right back for him. I ran into him a few days after the show and he didn't even know who I was. The next year I auditioned for the musical again and made it in and as usual, he was the lead. I could never bring myself to talk to him. The last year we went to the same school was last year. I took an advanced musical theater class and he was in it. It was the best thing to happen to me. I saw him every day doing the things I liked most about him. PROFORMING. He is just so amazing to watch his behavior, his smile, and everything about him, which was wonderful in my eyes. We also were in the same musical again but with me in the background and him the lead again. At one point during the show, I got to hold his hand for a second and my heart flipped every time. But during rehearsal one day he and I had to lock arms and we stayed like that for a long time. when the choreographer was talking his friend kept making weird faces and pointing out that we were together at the time I thought maybe he liked me but now idk. He is a year older than me so after that I could not see i thought he would never even look at me or just fully forget about me be he was gone  Thankfully I saw him again at my next show. I finally got a lead role and after one of the shows I ran into him. He talked ME he was so impressed with my performance that he took like 5 min compliment me and even gave me a hug it was probably the best thing to happen to me. I haven't seen him since that day and I want to be over it and I have no reason to still like him but I do. he has a girlfriend and I still think about him. I have dated people and still think about him. I dont know what to do I feel more like a fan then in love and i want it to stop what do I do