I like all the advice you've been given above-- and want to second (third?) what Butterfly and DnJ are saying... you can do this. You've already done so much of the work. You will get through this and you will be better and stronger for it.
On the L fees... can you put together a budget of how much you're comfortable spending? When you put your business-only hat on, and remove any emotional connection you have to the place, there will be a tipping point where it becomes more expensive to hang onto it than to move (factoring in the L fees, the expense of moving, increased rent, etc). I'd do the math and keep that number in mind.
I'm sure he doesn't think you're going to stand up for yourself. I'm actually getting a kick out of thinking of him realizing you have a kick-@ss L on your side now and won't be rolling over on this one.
We're all here for you, Cardinal.
xx M
Me (46) H (42) M:14 T:18, D9 & D11 4/19 - 12/19: series of escalating BDs 9/20 - present: R and piecing