We often say men aren't nurturing because they aren't as skilled at expressing feelings or listening. Male socialization has taught many men to nurture by solving problems. Solutions are male nurturance. The upside of men not being relationship-focused is that they don't discuss relationships behind women's backs. Providing a financial womb.
Men also nurture by providing a financial womb.
With children, the male financial obligation intensifies. The difficulty with acknowledging women as working mothers but not men as working fathers is that it deprives men of their biggest incentive to commit. That is, finding a woman who understands them in an era in which men feel so misunderstood. He knows that without success there will be no family. The women he wants most will reject him most quickly.