Something like 80% of couples don’t recover from infidelity. Of the remaining 20%, some are as you suggest. The rest do recover. It takes the person, who cheated, the understanding that they have to be willing to be held accountable forever until the mate has completed their grieving process. It means always keeping their location on, the willingness to be checked upon randomly. Answering all questions, no matter how salacious or damning.
The spouse that was cheated upon gets tongrieve their loss, no matter how long it takes.
The Higher Beatitudes: Humility and Compassion.