Why am I dreaming of my ex?

I have been broken up with my ex for more than 3 months now. I am in a new relationship with a guy I love like crazy. I don't miss my ex, I don't talk to him and I want nothing to do with him cause he was abusive. These past 3 days I have been dreaming of him, my question is why?
Why am I dreaming of my ex?
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