Why is he hurting me?

I broke up with my ex boyfriend 3 months ago after cheating on me. We had just gotten back together months before a previous breakup. i told him we can be friends but we will never date again. he does not want to be friends, he wants to be together. I given him so many chances but he just doesn't stop cheating. he is nice to me when I see him. he asks me how I've been and am I okay but he's been talking crap about me behind my back. Some of the stuff he's been saying about me is too overboard.
Why is he hurting me?
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