I would be interested in some examples of her making you feel crap. But for the record. She does not make you feel crap. Regardless of what she says or does YOU make YOU feel crap in response to her.
That will not change by moving out. It may be improved due to less interactions but unless you take responsability for your own feelings this cannot change.
Yes boundaries are essential too. Glad you see this.
Just a gentle 2x4, IMO you are not moving forward but still trying to get away from a bad situation.This is understandable.It has to be tough in your position.But moving forward is essentially about moving towards a better life, not moving away from negativity. There is a difference.
I don't like the term of this being the only option. It may be the best one for you now. But there are always several options. Choose your option and work towards it. None of us choose our situation but now that is where we are we choose our own path forward.
I am not saying don't do what you are thinking of. I just want you to reflect on these points.
Best wishes
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together