I agree, to a point. I despise cheating, especially when one partner is all-in.
But ultimatelly, when I learned to take responsibility for everything that happens in my life, I could instantly see that:
It takes two to tango.
And I don’t mean to judge or accuse anyone, but two questions appear in my mind:
How attentive were you to her/them?
Where do you find them (both did it almost the same way)?
It really makes more sense when one deeply considers a quote like this one:
"The greatest discovery of all time is that a person can change his future by merely changing his attitude." — Oprah Winfrey