Unfortunately, as most relationships mature, couples can find themselves bickering over small things. If those negative interactions, as minor as they may seem at the time, continue and increase, they can eventually pervade the relationship.
Imagine a day of pleasurable activities with someone who loves and appreciates you, followed by a bottle of Cabernet and a delicious dinner, laughing all the way, maybe ending the night with some light cuddling. That's a snapshot of a day in the life of an affectional bonding relationship.
Consider this: It may be psychologically healthier to end your marriage. Engaging in two different kinds of marriages may be a better response to the emotional and sexual realities of our fluid, interconnected world.