For a year, Jeffrey Eugenides read nothing but love stories in order to select the best for an anthology. With the tormented poet Catullus as his guide, he went from Chekhov to Nabokov to Alice Munro and discovered that the greatest works depend on disappointment, boredom and broken hearts. A review of My Mistress's Sparrow is Dead: Great Love Stories from Chekhov to Munro.