How to get over your first love?

Junior year of highschool I began a relationship with my ex. We dated for 2 and a half years and he was my number 1. I cared so much for him, did everything for him, he was my bestfriend. We had our ups and downs and fights and at the end of the relationship he started to change. He put his friends first. In my mind I had the same thing going on, I was moved away from home, I didn't think I wanted a relationship and was always curious about talking to other people. One day we mutually broke up, but he was the one to bring it up. After that he texted me and wanted to still be friends but not be together. We've been broken up for 4 months. The hardest 4 months of my life. We have hung out atleast once or twice every other week. Hooked up, had sex, kissed goodbye, just in hopes that maybe I could get him back. I still love him so much, but he tells me he doesn't want a girlfriend, he wants me to move on, he wants to talk to other girls and he wants me to move on. But I really still am in love with him, I really hoped that we would get back together bc he is so important to me. He was my rock. And for him to say those things to me literally crushed me. I can't even eat and it makes me sick to my stomach that my boyfriend, my bestfriend, my lover doesn't even want to be with me anymore. We've grown so much together and I truely would love to still be with him and have him in my life again. I saw him at a concert and he didn't want to even hangout with me. I got really depressed and couldn't stop crying, what he said hurt me so much. I wanted to say my last goodbye to him today, but he didn't text me back. So I sent him a long text telling him how much I still love and care for him. But I respect his decisions and this is what he really wants, so I have to move on. It was so hard to tell him bye, even in just a text. I can't even imagine not having him. The longest we haven't talked was 2 weeks. I really want him to miss me and want me back. I hope he realizes his loss