Infidelity is one of the most difficult problems to address in couple therapy, most likely because it involves a traumatic relationship event that alters the ways in which couples process information about each other and established behavioral patterns. We present a three-stage treatment designed to address the cognitive, behavioral, and emotional sequelae of affairs that integrates cognitive-behavioral and insight-oriented strategies with the literatures on traumatic response and forgiveness. A case study with pretreatment, posttreatment, and 6-month follow-up data is presented to illustrate the treatment methods.