I would like to mention something that seems to be unmentioned, but painfully obvious to me at least, a married man (somewhat new by some perspectives, so maybe that explains my idealism and naivety).
The point, the reason, the intention of marriage is not for self fulfillment of ones “needs” or appetites. It is to create something that is greater than oneself. It is to provide man some semblance of a purpose in life. To create a unit geared toward making the world a better place. Primarily through the betterment of one’s children, but more immediately the betterment of one’s self and spouse’s self. It is the most obvious and natural way in which man can accomplish this. Nothing in life that is worthwhile is easy, nothing! I would contend that successful marriages are so difficult, because they are one of the most worthwhile things a man can do. But in turn then, they must be difficult.
Many of you who contend that cheating is in our nature and therefore no big deal, miss the fact that lots of things are in our nature and a really big deal. People are capable of violent hateful things in addition to being capable of great acts of charity. Murder is certainly in our nature, but that does not make it justifiable. I have a desire to drink lots of beer and eat lots of pizza (thankfully, my wife mentions this often) and if I let my appetite reign supreme I would be a fat lazy sob unable to do the things I love doing most.
Difficulty builds character, and a marriage with a well matched partner will breed character no doubt. But those who cheat are the ones who really lack the character. For what its worth, many who don’t cheat have no character either, but lack the balls to go through with their wishes.