Getting over an ex

My high school boyfriend and I were together for around a year and a half before we went to college. During the summer, we were drifting apart. We only hung out twice because of vacation schedules. He didn’t even come to see me before I left for school.

During my first week of school, I broke it off with him, telling him that he wasn’t showing enough effort and I just didn’t feel loved and appreciated anymore. However, we were still Snapchatting after the breakup as friends. I think that gave me false hope that we would eventually get back together. When I asked him if he thought things would ever go back to normal, he sounded like he didn’t really want them to and didn’t want the relationship anymore. After that, I told him I wanted to stop all communication entirely because there was no point if we weren’t going to get back together.

Now, I just feel sad. I can’t stop thinking about why I’m not worth it for him to try harder for me and our relationship. I know he was probably not the one and I know I deserve someone who treats me better and more special, but how do I stop thinking of our good memories together?

I feel like my sadness and pain is unjustified because I was the one who ended things, but I’m just so angry that he didn’t care about me enough to show me that I was special.

How do I get over him???