@EJ5
Faith&Hope said ". but because we forgot to raise our shield against the damage that can be caused to us by their behaviours and choices if we don't. " and that is so true.
I had actually reached the point where I believed he was deliberately trying to gaslight me as part of coercive control. I had a talk with his psychologist about it in the hope that she could raise the issue of the way I was feeling like an abused spouse, but I learnt a few more things about his very complicated neural make-up that put it into better perspective.
I was using the wrong shield. I was running myself ragged trying not to make him angry and failing quite miserably. I would be admonished for things that he thought were obvious that even after explaining to me several times I just didn't get why they were wrong. It felt like the goalposts were constantly shifting. Was he doing this deliberately to undermine my confidence and set me up to fail?
While the bipolar comes and goes (I chart his moods) it turns out he is much more autistic than either of his sons, but such things were not diagnosed in the 60's. Now I am much more aware of how literal he is, and how literal I have to be, and how anything that deviates from the plan he's made in his head activates a trauma response. When confronted with flight or fight, he never flies.
Now I have the correct sheild/oxygen mask/mental tools to deal with him much more calmly. I think part of protecting ourselves is learning as much as we can about them and what they struggle with. See if you can get his permission to ask his doctors.
Good luck
S