Our experiences sound really similar. My ex fiance also cheated on me for years and would tell me it was his right because of how badly I treated him. He accuses me in heaps so I dare not talk with him anymore. Because it was so distressing, I experienced hair dropping too.

What I am trying to say is I really understand. And I agree with Lightning Man to just move on, apathy is not hate. Its just nothing. Don't give him anything more.

Hugs, and all the best!