Another fake death
We think that faking your death to get back at your partner for cheating on you is a little bit extreme. He must have really been hurt to go to that extent just to make her feel terrible. Or maybe he wanted out of the relationship and this was the best way he knew how to do that.
It still sounds a little bit childish to us, the story never states whether or not he came back after faking his own death, maybe he just did it for a few days. Meanwhile, he watched how his wife and family would react to the sad news and then would come in through the front door after he had enough.