It's the fatal misconception about "equality". For decades, women have had it drilled into them that men and women are the same except for minor physical differences. This leads them into the fatal miscalculation that men think the same way they do.
Women are sttracted to high-status powerful males. For a woman, there is evolutionary benefit in picking somebody who will be able to provide for and protect you and your kids.
Men are attracted to healthy, fit women in their prime child-bearing years. There is evolutionary advantage in planting your seed in a fertile location. There is advantage in having kids by a woman who is fit enough to be able to raise them without you if need be
Nowdays it seems like most men want a woman who brings in money enough to pay for "her half" of everything, but I've never found a man who wants to do "his half" of the housework. When it comes to money, they're all modern men. But after a day of both partners working, when nighttime comes and there's dishes and laundry and cleaning... gosh, they're just too darn tired.
They don't mind me exhausting myself to make life comfy for them, they like being mothered. But let me fall behind financially and they are quite put out at having to pick up the slack, even if it's only temporary. And time and again I've just come to feel "I take care of you but you don't take care of me." So I'm on my own, and I'm kind of sad about it sometimes, but ... I just can't do that anymore.