From a Christian perspective, and I mean from a perspective of true believer in God who lives a life that is not a "saint on Sunday, sinner on Monday and the rest of the week" - having a faithful marriage is very possible. Some Bible quotes: "Love binds us in perfect harmony" "Love is patient and kind. Love is not jealous or boastful or proud or rude. It does not demand its own way. It is not irritable, and it keeps no record of being wronged. It does not rejoice about injustice but rejoices whenever the truth wins out. Love never gives up, never loses faith, is always hopeful, and endures through every circumstance."