At best, the merger of
romantic love and marriage is relatively recent and relatively localized.
We have posted in the past about the history of romance being converted into covenant marriage. Marriage has always been in transition, and, for better or worse, it is in transition now.
As I have said countless times here, I don't know how people can run an orderly, complicated, and productive life without a committed partner, much less create a family with all of the things family entails - finances, traditions, social life, stability, values and religion, disciplines, etc. The very wealthy always could do that, but not otherwise.
I never forget the story of how Thomas Lincoln (Abe's father, a prosperous and prominent Kentucky farmer and real-estate investor at the time) hopped on his wagon and drove to the nearest city, leaving the kids in charge of themselves, to quickly fetch a new wife after Nancy died. I believe he fetched the first widow he could find, Sarah.
Today, he would be arrested for leaving the kids on their own.