The issue is the modern view of relationships being due to the view that it's about love and people expecting more and more

From their relationships when historically that function was divided among broader family groupings

A person in relationship is expected to a lover, a best friend, a husband, and a host of other things which can be too much

Also relationships are I built upon transactionalism that doesn't have to be a bad

It's just the truth

As for Economic models there's never been a economic model for what we are going which is modern