For his marriage? No. That one's toast. For whoever may cross his path in the future? Sure. He needs to become the best he can for one but himself, period. And certainly not her. She was involved with another man and ALL that went along with that. If he were to ever take her back, then he needs to take stock of his own self and see if the price of the soul/dignity/etc is worth it.

All for him and nothing else.

There are moments in this life when you are so confident in the rightness of your actions, that not even for a second do you consider the option that you might be wrong.