I think the Man in Black could be seen as somebody who was a sociopath or a psychopath in that way.
And I think what’s so devastating for her is not only did he become this abusive nightmare to Dolores, but I think he’s convinced himself that it wasn’t real, and she knows, deep down, that it was, and it’s just wells of grief and sorrow with those two.
I think what’s so tragic about the relationship is that she really did come alive with him, and he knows that, and he knows that it was real, and he has no idea how to get it back, and that’s why it’s devastating for him.
And a lot of times, those people can seem really normal on the surface, but obviously when you put them into a setting where nobody’s watching, and he can be who he really is, this other thing is unleashed.