Is a man obligated to divorce his wife in the case that she has been spending his money (10’s of thousands of dollars) without his consent?
There are a few reasons why a man might be obligated to divorce his wife, which are basically related to her being promiscuous. If she spend his money without his permission, is not a reason why he is obligated to divorce her. As a side point, it seems that the couple need some guidance, and marital counseling, to help them overcome this and any other underlying issues.
Even Haezer 115-4, 119-4.