How should I get over this?

hey (sorry for my English)

so it's about 3 months ago that my ex broke up with me. Whenever I think that I got over my ex, I get sad and start crying. I hate it. He broke up with me because he wanted to concentrate on school. First I understood him and leted him go. But now whenever i think about the break up and the things that he said in those texts on that day I start think that he probably had met someone else. I knew him as the best but the way he broke up with me was not the usual him. After 2 days I asked him if anything hard is going on in his life but he said that only school had became hard and that he didn't want me to wait on him everyday for just 1 text. So now I don't know how to get over this.
How should I get over this?
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