It is because at the crucial moment, he has given his loyalty to the wrong place. Preserving serenity with his mother by sacrificing his wife's trust: this choice, even if unconscious, destroyed everything.
Family pressures exist in every household. What really matters is how we go through them together — or how we fail to do so.
Trust, once shaken, cannot be rebuilt on a simple excuse.
*Some wounds don't heal with words: they require much more courageous actions.*