Why did he turn his back on me :(?

Ok I liked this guy for sometime now. We use to talk but we stopped. I guess because we have no cles together. I tried to get him to talk to me alot but they never work. Well today in homeroom I sat next to him and he had his back turned on me. I was on his right and he was talking to his friends on behind him and left side of him. It was like that the whole time. I kept thinking he wanted to talk to me because I see him look at me sometimes. Now I am mad and TRYING to get over him.