Normal
People gravitate towards resources and once they get resources they can then focus on other things like goals, money, happiness, etc. So loveless marriages are sustainable but resource-less marriages are not. When you account for the amount of resources one has, it increases their rarity, and makes it more difficult for that person to be replaced. So if a woman is with a rich man who has a lot of resources, she'll forgo love in order to not have to make a huge standard of living change. She'll step out and find the love somewhere else. If you don't think Melania Trump got a side nigga you trippin.