Consider checking out "Sunk cost fallacy".

You say you want to remain with someone who will never apologize or admit they are wrong and so, you can't leave because you'll never get closure.

So, taken to the logical conclusion (since people don't suddenly change), you won't ever be able to leave unless and until the therapist decides to terminate you -- which going by her history so far, is likely to end up being equally unexpected and painful to you.

And, it'll be entirely at her whim -- could be tomorrow or a year from now or 10 years from now.

I wonder how that'll feel....

P.S. I say this as someone who's also been unable to easily walk away from toxic dynamics, including with current T.