I don't think they know. I do think that they think everyone else is always in the wrong though. Just as a small example I recently left a controlling relationship. I do think of myself as quite strong and when I spoke up and told him I'm leaving because he is controlling, he was outraged. And denied it. Over and over and over again. And then when I pointed out that even this is controlling, he just would not accept it.
It was a bit of a mind fuck I won't deny it.
I then realized that he lived by moulding himself into the next person he meets lives. He doesn't have his own friends, his friends are the partners friends. He doesn't get in with his family, his partners family are his family. Even his own child he doesn't treat as his child, but did mine.
And now, during lockdown he is all alone. With no friends and noone running after him in a way I feel quite sorry for him, but I don't let him know that as he is playing on that fact.
Due to one issue we have kept in touch randomly. His ex wife left him but I never heard him say one good thing about her. All I ever heard was how awful she became, diagnosed with bioloar and addicted to pain meds. I asked him how she is doing during the lockdown (as he keeps in touch with her too, for no reason really they didn't have children together, it'd the control aspect I believe) and he said that apparently she said she is doing fine, is 'miraculously' off get meds, started a sport etc. So it sounds like she is doing well. Only then did I realize that this is probably because she is no longer in the relationship. I'm am so glad she is doing well. They got divorced and back together 3 times. Why thus wasn't a red flag to me right at the start I just don't know.