Marriage: An Evolving Institution
Marrying for love -- and expecting fidelity -- are both relatively new developments.
"In ancient India, falling in love before marriage was seen as a disruptive, almost antisocial act. The Greeks thought lovesickness was a type of insanity, a view that was adopted by medieval commentators in Europe. . . . In China, excessive love between husband and wife was seen as a threat to the solidarity of the extended family."
SOURCE: Stephanie Coontz, "Marriage, a History"