Yes I believe I have.
I dated someone for 2.5 years when I was young. They were highly manipulative, controlling, vindictive, violent, jealous and selfish. All whilst maintaining an incredibly charming persona to everyone else, and often to me. He was extremely good looking, very clever and charismatic.
He literally saw and heard things that were just not true or even real.
Was very cunning and clever.
To be blunt, he completely fucked up my self esteem for a number of years.
It wasn't until about 4 years ago (10 years after I escaped) that I learned he'd had several psychotic episodes, spent time in prison for attacking someone with a knife, had a court order against him preventing him seeing ex wife and kids.
He was diagnosed with bi polar disorder combined with some kind of psychosis.
This is different I know, to the true clinical definition of a psychopath, but in my mind he is one.
Dating one is horrific and incredibly damaging.
You will never win, or change them. I ended my relationship and he told me I was a selfish bitch who would never find anyone else. Especially with my disgusting ugly fanny. (Yes really!) And if I did he would kill them. Then he told me if I didn't get back with him he'd kill himself and everyone would blame me.
I had gained enough self-esteem to tell him that was his choice and nothing to do with me. Of course he didn't. And it was the last time I ever spoke or heard from him.