It seems that the institution of marriage is the issue and not human relationship?
Significantly higher than the 6% decades ago. Which seems to indicate human relationships are indeed in decline (the institution of marriage Is likely also in decline, but it’s not the sole reason for the high percentage)
Tie in the fact that the average salary can't support the 'traditional' lifestyle, and the desire for 'traditional' dating expectations. And now you have men checking out for one of many reasons, for example: not making enough with the right type of career.
And personally I see an unsustainable desire in women my age to travel. So instead of saving for the outcomes they might want (marriage and kide), an expectation that the man will provide the necessary support.
The typical “poor” person living in the USA lives in the lap of luxury (in terms of clothing, food, shelter, etc) compared to a serf in medieval Europe, a peasant under the Assyrians, etc. I mean, how many poor people have running water, electricity, Air Conditioning, etc.? Can you imagine a poor person from 3,000 years ago seeing that and then hearing talk about wealth inequality? It would sound insane.
Cesar Augustus was worth $4.6 Trillion. That’s a pretty huge wealth disparity to a common person back then. What about Mansa Musa? His wealth was so vast that nobody even knows how to put a number to it. Do you think the common people under him were rich?
Are there number on how many of the cohabitants are raising children and/or have a mortgage together?
If they have one or both, but are not married, then the traditional family has just evolved without the need for marriage.
I wish more research was done in this area, it’s obviously an important one. Dating apps and their consequences seem to be a disaster in the making (if it’s not already here).