Is knowing the truth worth living a lie?

Based on a short story by Bernhard Schlink, The Other Man is a love story about a man (Liam Neeson) who discovers that his wife (Laura Linney) has been involved with another man (Antonio Banderas). The husband sets out to find the other man, and forms an unusual friendship with him; through a series of informal meetings and emails, the husband uncovers the truth about his wife's affair, and in a stunning denouement, reveals the truth about his wife to her unsuspecting lover.