Hey SweetJudge- I'm an SO, albeit a soon to be divorced SO, so I will say this about a thing that made our marriage worse, because I've seen it in other people's complaints when I read about them:
It will save both of you a lot of heartache to take some time to figure out what you actually want from your marriage, and be both kind, and honest about that. Also, be understanding about the fact that both of you might need time to figure out what you want. This goes for BOTH sides, btw.
My ex went back and forth, and back and forth about what she wanted for our future. Eventually, I could see what it was she wanted, even if she couldn't admit it to herself: She wanted to be single again, to explore her true self, without me there to remind her of her old life.
Although the divorce papers have been signed, I get the impression that she STILL cannot admit that this is what she wanted.
It would have been a far less hurtful for me if, right from the beginning, she told me that she honestly didn't know if she wanted to be married to me anymore, and that she needed time to think. Instead, I got a bridge burning festival, with periods of being treated like a bird in a cage, expected to obey whatever commands my master made, without question. It made for a nasty, messy divorce.
On the flipside of this: I frequently encounter SO's who are reportedly trying to bear the changes their trans spouse is making, but are either 1. not attracted to the new form and trying to force their way to being a new sexuality (and probably need to admit this to their spouse, who could feasibly work with them on it) or 2. having serious difficulty accepting the new person in general, and angry and resentful of who their spouse is now (and again, seems like admitting this and letting marital counselors do their job might help here.)
Just my thoughts though...
Love and hugs