I read this thread in fear. Having just finished a five year 'relationship' with a NPD and as it is my home, I had to get him out, which he didn't want to do, so police and social services were involved.
This was my second NPD relationship - I ignored the red lights, hoped I was wrong, after all he was so loving to me. Both relationships followed a distinct pattern described here and elsewhere - Love bombing, ghosting, gas lighting with the odd sprinkling of aggression, abuse and character assassination thrown in for good measure. My computer was hacked into, all conversations were recorded and photographed on his phone 'for future reference'. My friends were alienated by him. It was all my fault, how could anyone, let alone me, the woman 'he loved most' discard him? poor, poor him.
I now await the flying monkey treatment. He's moved round the corner, with 'a mate', it's a small town, everyone seems to know and like him, 'what a lovely bloke he is, weren't I lucky'. No one really knows him, not even himself, he's a chameleon.
It's too easy if you're lonely, yearning companionship, maybe even love, to get reeled in by these insidious people (there are women NP's too, but it's rarer). Fortunately we're now more aware of the traits of the charlatans, so if you feel somewhere inside when meeting someone 'that's too good to be true', listen to that inner voice, because he probably is, he doesn't know the meaning of the word 'truth' please, just run away.