It’s interesting how you repeatedly expand the issue and circumstance out to such generalities that they become platitudes with which few would disagree. Yes, obviously, any two people will have disagreements at times and do have to make compromises. But in my book, that doesn’t excuse keeping something secret that if found out, would greatly hurt the other person and change what that person thinks the whole relationship is all about. Basically, you seem to be saying that an affair (including platonic ones) are no prob, as long as the other person doesn’t find out. I call self-serving bs.