You're getting a lot of undeserved scorn, fam. I think it's fair for you to say that based on your experience, walking away can be the right answer. In fact, if anyone finds themselves in a situation that brings back past trauma, or they don't feel safe, or they don't feel in control of their emotions, it's perfectly reasonable to walk away.

I think people are disparaging you because it sounds like you're saying the guy should just cheat, and if he's caught he should just walk away without remorse. I don't think that's what you mean, but people might legitimately interpret it that way.