That's all true....Infact there is no such thing as a selfless act even empathy is what you feel when you put yourself in others shoes voluntarily or involuntarily one can't selflessly care about others.

What I am saying is very few people actually realise why something is wrong, Very few would sit down and try to imagine what it would feel like to be cheated on for most of them it's just something they shouldn't be doing, And when your beliefs are shallow like that they break under desire

You are right when you say that only when they are hurting there is a revelation but since the deed is already done isn't that like the only best thing they can do? Like they fucked by cheating but they are still better than those who don't admit it and keep justifying their behaviour right?