So, it's been two years and he's still there... texting me and calling me. I tell him to leave me alone and he comes back. Why?

He has a girlfriend and that's why I cut him off. I'm always blocking him and he gets a new number. I asked him to leave me alone and he goes away and comes back months later. Recently he came back saying something reminded him of me and then asked me if I am making birthday plans for me... obviously I ignored him.
So, it's been two years and he's still there... texting me and calling me. I tell him to leave me alone and he comes back. Why?
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