Hi Axa,
About my exNbf (well, he's surely not an xN...) I wanted to tell you I had a very similar heartbreak plus horror reaction, when I figured out how calmly he used me.
Years later, both feelings are gone.
I really do not perceive him as evil, now, but I look at him just as I look at anyone who is too destructive to associate with.
For example, if I see a person on the street who is ranting and waving a machete with a wild look in his eyes while screaming epithets about women, I will scurry away. Looking back I might have compassion, but a frisson of fear. Looking back even later, the incident would be drained of emotion. I will remember it neutrally. Kind of like, "I lived in Pennsylvania for a couple of years."
I think this is the best outcome. I think we all can get there.
My D does not understand how neutrally I speak about her grandmother, these days. She can't fathom it and keeps prodding to see if I'm a victim. I think over time she's begun to believe that I'm really not in a state of agony over my mother's Nishness any more.
I can see this coming for you too Axa. But I am glad you got furious. That's an important stage.
hugs
Hops