I dont understand?

I don't understand. I dated my ex for a while before he ended up cheating on me. We ended up talking it out and staying friends even though we both still had feelings. Eventually, he tried to get w me again and i told him i didn't want to, so he blocked me. A couple weeks later he unblocked me and randomly started talking to me and when i asked him why he blocked me he said "idk" but then i saw him yesterday w his new girl, and they started like following me and taking pictures of me from behind buildings and shit? anyways, he's a dick and i hate him but ya
I dont understand?
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