How do you get over a break up?

Even though my boyfriend and I dated for almost year and that probably short to some people, it still hurts a lot that we aren’t together anymore. Like I can even look at him cause I want to cry. I blame myself. I’ve been so stress with college stuff and school work. That I talked to him and said I see him more as my friend then my bf. Truth is I was just so stress and he was adding to the stress. We didn’t spend as much time together anymore and I wasn’t acting the same. I was always stress and easily annoyed. So if he annoyed me, I would take it out on him. This happened for a week. We talked and he was like can we try again can you try to love me in that way again and I said yeah. I couldn’t hurt him I cared too much for him. After 3 days he broke up with me. We talked 3 days after and decided to be friends. I still love him so much. My mom tells me I’m only 17 idk what love is. But it’s like I have a whole in my chest. Like the person who has been my support for almost a year is gone. I miss him. We said we would be friends but we don’t even talk he doesn’t evening look at me. And I’ve been crying and it just hurts and idk what to do. My mom just told me that’s why I said to not date in high school. Like that doesn’t even help. I regret letting him walk out of my life. I’ve been trying to distract myself by burying myself in school work and doing my college applications. I can’t even concentrate on doing those things because all I think about is him and wondering what he is doing. How he is? If he is hurting as much as I am? Does he need me? Is he happier now? Today we had pep rally and I passed him in the halls. He was talking to this girl. He was telling the girl how he was going to walk with her. I know this girl we became friends because they were friends and I was jealous but she was dealing with her own boy problems. She would tell my bf about them. But now I’m wondering during our relationship if he ever liked her or something. Idk I was probably reading too much into this. Anyways that’s besides the point I just wanted to know how do you get over break up and if you read this far thank you I just don’t want it to hurt anymore.