My marital counselor told me way back when my XAH and I were trying...he told me privately...that he was pretty certain my ex also suffered from something something narcissistic personality disorder and even if he went to rehab, our relationship would be very, very difficult.
I remember being really sad about that.
I am still sorry we didn't work out...but...we were insane together...and my current loneliness is still way better than that!!