Oxytocin, a hormone much involved with falling in love, mother-child bonding, and lifetime pair bonding of sexual mates, binds to receptors on the dopamine-secreting neurons in the brain’s reward pathway and enhances the firing of the reward-circuit tract. In other words, oxytocin leads to an increase in brain dopamine, a recent finding by Stanford neuroscientists Lin Hung, Rob Malenka, and their colleagues.
After his honest disclosure to his wife, followed by her expression of warmth and empathy, Jacob probably experienced a spike in oxytocin and dopamine in his reward pathway, encouraging him to do it again.
This is why being honest and present helps to deal with addiction