When my wife was about 22 o 23 years old, they finally had enough with the father and decided to kick him out for good.
She has a younger sister, 16 at the time, and another even younger sister, only 9 yro, with Down Syndrome.
My mother in law never worked in her life, so the 4 of them depended entirely on his financial support. But, the cons finally outweighed the pros.
You can imagine how extremely difficult it was for such a family composition. They could barely eat, get some clothes mostly from friends, and live by the day. For the first year the 16 yro sister cried all day because she figured they'd just die out of hunger without his money. My wife and mother in low were more determined and were able to endure and stick to it.
25 years later, they ALL agree that there hasn't been a single day where day wished they traded their peace of mind for his money. It was though, but living with him was tougher.
So, while I have no idea about your marriage, and I'm not at all suggesting you should separate, I do suggest that if you don't, is not because you erroneously imagine that you can't be on your own and take care of the kids without his financial support.
Money ITSELF is not essential, what is essential is to eat, to have a roof, to have something to wear, etc... and yes, you get those with money, but, to smile, to love, to get a good sleep, to enjoy a simple moment, etc... that is also essential, and you can't sacrifice the later for the former.
"where there's a will there's a way", and you don't need his money.