I used to think I would leave my spouse if he cheated on me, no matter what the reason. Today after 18 years of marriage, a lot of connections, memories, and tragedies, I would have to really reconsider my stance.
I think now I would have to look at the reasons and why it went in that direction and analyze what could have been done to prevent it.
I cannot really say if I would divorce my spouse for a one time incident. I believe now we have such a bond and a lifetime of companionship, that something would have to really be wrong in our relationship in order for him to cheat.
Some men however, are just plain dogs, and would cheat even if their wives were the best women on earth. That is not my situation, but I know women who are in that situation, and some men just cheat because they can. Those are the men that should be left!