Just because he’s home now can not be used as an excuse why you let other people down, people who have come to rely on you, people who make you feel you are worthy to live.
You look back on your life; Your Life Before his Adultery, and cringe.
Was I that stupid? Self-sacrificing?
The money you had used to buy him filet mignon is a new hair style. The time you used to spend doing his laundry, you use to write articles for the PTA, the beer which used to fill the refrigerator for his friends is no longer there, but there are quite a few new pieces in your wardrobe.
He can survey what used to be the matrimonial home and appreciate, he’s not needed.