What is it about cheaters who won't take no?

He keeps trying. Before he had a relationship, after a few weeks and now even after a few months..

I told him no for so many times these last couple of days and he keeps finding me on other social media accounts or other accounts.

What's the deal with him?
Why is he so consistent? He wasn't even that consistent and serious about me when he and I started seeing each other. He always had one as a back up plan but when he gets in a relationship with them, he thinks he can still try. I told him that I am not a homewrecker but he doesn't care about that and keeps saying;
- "you are being so weird about this. Do you dislike what we are?"
- "it's so weird as if you hate me"
- "why are you being so difficult?"
- "don't worry about it. Only you and I will know."

He just won't stop.
What is it about cheaters who won't take no?
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