I have no problem with us discussing marriage in this conversation. Just clarifying that there should be no debate on the best
pizza topic.
As for the marriage, I'm speaking statistically. With over 50% (closer to 60% in some reports,) of marriages now end in divorce. Studies show that most end from fights over money. Probably a high percentage also end from not sitting down and having serious, heart to heart discussions about whether they have shared values and life goals. There used to be a time when pre-marital counseling was the norm. Another amount probably fail due to not knowing how to resolve their conflicts. But, there probably is a great percentage where infidelity occurs in that close to 60% of failed marriages.
Personally speaking, as someone who has come from abuse, have been in abusive, lying and unfaithful relationships, and counsels women in domestic violence & abusive relationships, (infidelity may or may not be part of it,) in
my particular environment, happy, successful marriages are not the norm. (I am not a
marriage counselor.)
I'm still hoping and holding out to find ONE great guy. Stories like from the OP and others, and the recent, "Why do you love your SO" give me hope and
affirmation that they
are out there. They are kind of unreal for me, given my environment and circumstances. So threads like this are a nice reminder that they do happen and are possible.
Again, I have to wonder why this thread would be so horrifying to you. If you are
certain that your particular marriage is really so strong, professionally speaking, I can tell you, this thread wouldn't have such an emotional reaction on you.
For example, if I say, "The sky is blue," you wouldn't have an emotional reaction, unless you are a meteorologist/scientist, who has to correct me in saying, "The sky is not really blue, it is reflected light... yada." Or, if you are an artist, who needs to correct me, "No, actually the sky today is cerulean with touches of azure."
Those two people would have a
natural and expected emotional response to someone saying "The sky is blue." To
everyone else, it would either be information or opinion. They may have their own thoughts about it, but it usually doesn't register enough to get a response.
But, when there is an intense emotional response to something, we counselors, (profilers and lawyers too, they call it a trigger,) pay attention to the stuff that registers high on the emotional response meter. Especially when people are
proclaiming, "Why is this such a big deal?"

If it's NOT a big deal, it really would barely register enough to even get
any response.
I explained a couple paragraphs above my situation. I hope I
manage to find a marriage that doesn't involve cheating or lying or abuse. That is not reflection on what anyone else has been through. I certainly don't mean it personally when I hope & say that. I'm still trying to figure out if I can even
recognize 
a guy who actually won't cheat or hit. That is about ME, not anyone else.
If others have
managed to find a marriage that doesn't involve cheating or hitting, more power to them!!!

I want to know HOW they did it.

Obviously, in the relationships I've been in, and many of the women I am acquainted with, we can't find or recognize these guys.