The industrial age changed romance
For most of human history, there was no time for romance. Marriages were arranged by families and were a purely economic arrangement designed to promote the survival and prosperity of both extended families.
It wasn’t until the industrial age that things began to change. They didn't have to rely so heavily on family connections any more. Consequently, the economic and political components of marriage ceased to make sense.
"Having someone wonder where you are when you don't come home at night is a very old human need." — Margart Mead
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