Dear Thornbird,
Know that you are constantly with my prayers and meditations.
This saddens me, " is anything I can do to support and help my partner and myself and would be so grateful."

First you have to help/heal yourself. Rebuild your self esteem
From what you have posted imo, You are suffering complex ptsd, imo.
degradation, anxiety, depression.

You don't have to stop loving this person.
But no to cohabitation.
If you can't leave because of resources, tell us in group by yes or no.
I have been there. and I am here for you.
Allow those who want to help you in, you don't have to share everything.
Privacy concerns are real but there are ways of communicating without disclosure.
Warm/Peaceful energy coming your way.
Sincerely,
Happiedasiy