I am in somewhat of the reverse situation, although I only make twice what my STBXH makes, not "many times more". He thinks I'm divorcing him over the fact that I've worked full time and he's worked part time, and that I resent having to be the higher earner. In my case, if everything else in the marriage was fine, the fact that I make more and needed to work full time would not have been a deal-breaker. He thinks all I care about is the money, that I look down on him for having a lesser-paying job. But, no, that was not the deal-breaker. What was the deal-breaker was that he was gambling away our joint money, and yes, since mine was twice what his was, I felt he was wasting our money, obviously, but in particular, making the fact that I worked full time all for naught, as he was wasting the extra money, which I did feel was due to my hard work. I did resent having to work full time as opposed to what we had been doing, which was both of us part time and each watched the children while the other worked. So, when I needed to go full time due to his mental health situation (quit one job suddenly, let go of next job), it was no longer fair in my eyes, as things at home still fell mostly to me. He did the outdoor work that the neighbors could see (he's very concerned with appearances), I did the indoor stuff that he would complain about if I hadn't done it all ("this house looks like a pigsty" being said to me More than once, which I received as a dig on me....working full time and he part time; if he could see it was a pig-sty why couldn't he pitch in instead of napping?). Yes, so, disrespect, financial waste, and then him accusing me of only caring about the money. Because at some point, I wondered if his mental health would ever be at a point when he could either pick up the slack at home or get full time work so I could cut mine a bit. The man took so many naps and was depressed and yet cold turkey stopped seeing his mental health providers And taking his medications. Hospitalized twice. Tried over and over again to encourage him to seek help. I was also greatly concerned that our retirement money would be gambled away, and that he, when we were both retired, would want to spend all his leisure time gambling, and we would lead separate lives anyway, except we might be destitute. I don't think this is an unreasonable fear, given his track record.
So, awaiting the attorneys to hammer out an acceptable settlement agreement. He thinks I owe him spousal maintenance, but guess what? After all the years of him working part time only, he suddenly, when confronted with the fact that the law would impute full time hours to him whether he worked them or not, managed to increase his hours to full time.
Like magic.
And restarted his mental health therapy.
Like magic.
But I hear from the kids that when they're with him, he still smokes in front of them (another cause of my leaving him; refusal and contempt of my requests that he not smoke in the house, in front of the children, in the car with us), and that he disappears on them, they aren't sure where he went. I suspect he still goes gambling. But not my problem anymore. The kids are older now so him leaving them outside of work hours is not a crime.
So, assuming you, OP, are not a gambler or wasting money otherwise, addicted to shopping, etc, it seems perplexing that he would be so financially controlling only. Is everything else in your marriage AOK or is he also controlling in other ways?
Are you happy? Is he happy?
Mine always claimed to be happy with me, until I told him he had broken the last straw, and we were done. Then suddenly all his gripes about me came out. Yet over and over "Am I really that bad?"
Just wish I had left years before, but I always had hope he would become an adult and take responsibility for his own well-being. Once I saw it would never happen, I had the strength to end it.
Good luck with your situation. But do not give up what you are legally entitled to. I consider myself very lucky to have landed in a career that can fully support me and our kids. I will happily pay the child support I will be charged with, but would be very unhappy if I end up having to also pay towards a gambling spouse's maintenance.