These cheating people are the same people that get married, then when they get divorced say, "I knew they were'nt the one for me!"! What the fuck did you marry them for then?
I just don't understand it. My wife and I have always said that we love each other enough, that if we ever found anyone else so attractive that we wanted to do something about it, we would at least have the common courtesy to talk about it first. Because lets face it, if you are looking elsewhere, your marriage is over anyway, sooner or later.
Maybe it's because I saw the damage a cheater and liar can do as I grew up, I like to think we all instinctively know right from wrong, just not everyone sticks with it.