“My ideas of romance came from the movies,” said Woody Allen, and it is to the movies—as well as to novels, advice columns, and self-help books—that David Shumway turns for his history of modern love. Modern Love argues that a crisis in the meaning and experience of marriage emerged when it lost its institutional function of controlling the distribution of property, and instead came to be seen as a locus for feelings of desire, togetherness, and loss....