The true reason behind it is understood. It’s called lust, selfishness, disrespect towards spouse. Or, you an call it looking for a new self, self discovery, and to know what it’s like for people who aren’t good. I guess. Would it be easier for the wife to understand it if the husband gave these ridiculous selfish reasons for cheating? I’m not sure if any excuse for adultery is easier to accept than others. For me, I wouldn’t want to know why, I don’t need to know why, I would need to divorce/move on.