If they stayed married until he died, then it obviously worked out.
It worked out in the sense that they still lived together. It’s hard to know how happy anyone is in a marriage. It was his 3rd and her 4th marriage.
It seems cruel not to tell her that right after he dies she must move out of the house because it’s to be sold. That’s a surprise while she’s grieving. He couldn’t have been real happy to do something like that. I guess they used each other for what they wanted.