Why won't my ex ever leave me alone?

My ex and i broke up last year in July. He cheated on me. I haven't seen him in person since we broke up however he keeps calling and texting me. It's been a whole year and i have blocked him from several numbers he's created. He keeps texting me every now and then that he will do better and get his life together so we can be together again. He knows im seeing another guy and has been asking me about him and thinks that I blocked him because of another guy.

Why won't my ex ever leave me alone?
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