It's not all one sided. Sometimes the woman is evil, sometimes the man.
I knew someone whose husband claimed he had lost everything gambling. They had to move out of their million dollar house and move in with relatives. Husband expected his wife to divorce him. She doesn't. Instead she goes to Gambler's Anonymous to help him with his problem. Finally the real story comes out after a year. He had given all their money to a girlfriend to hold and had been hoping the wife would start divorce proceedings and there would be no money for her to get. Girlfriend turns around and runs off with the money!
Sometimes I think there's some truth to the idea that no good deed goes unpunished. Not that that ought to stop anyone from doing what's right, just sad when things don't go like I think they should.