I tried to think of a reason why my hurtful one was the way she was, and based on the assumption there was some reason, I guessed that it was primarily revenge that had had to be suppressed, unacknowledged, etc. It felt like cruelty for the sake of cruelty sometimes, but if that were true -- wouldn't I have acted that out more IRL? That's what I guessed anyway. That idea didn't stop the feelings right away by a long shot, and of course she, and a male companion (alter), tried to find ways around what "I" was trying to rationally do, too.

Maybe they didn't trust my dawning awareness of them?

It's better now, is all I can say. How it got that way -- I'm not sure I can say. Maybe it was just the years and years of fighting, struggling to get more awareness and "accept" -- try to find some ways to accept -- the "evil" parts.

Regular mental health professionals didn't have a clue about this and even my last T, a specialist in trauma and dissociation, didn't have much of one. I think the regular mental health people may have made things worse, the specialist probably helped in some ways, not in others.

Your own awareness is probably your best ally. Even though the demon may not think so. And as of right now, my evil parts are mostly OK with me, not actively fighting me so much any more. And, as I said, they have some useful intuitions and instincts about the world -- not always correct, but it's useful information anyway and ignoring that stuff got me into a lot of trouble, too. Maybe the fact that "I" now have found ways to respect them helps some?

Good luck and take care!