I can't speak to the NPD element, but being disorganized and having BPD, I can say it's a mixed bag. Some people in my life have made a lasting impression and I have struggled to move past the relationship I had with them - though I do because I know I can't give them what they need which is unfair.

Some relationships I rarely think about and don't care. My kids' father falls into this category. He is a damaged person (even more so than I am). He hurt them. He hurt me. And the few times he's reached out to say he's changed have not included meaningful or lasting change. At this point he is nothing to me. Having fathered my children you'd think I would have some emotion, any emotion, about him, but I don't. He is dead to me. And I know that hurts him more than if I hated him.