The very concept is “cheating” is assuming one is lying. They’re the same. Truthfulness is trust. If I love someone and they love me I couldn’t care less what else they do with their genitalia. If my partner tries to hide another from me, I know the trust is gone and that betrayal is what is so hurtful. Respect and trust me enough to tell the truth.

I think that a majority of the population stretches the truth a tad bit and so fibbing about trivial things wouldn't bother me - cheating however, is a completely different matter and I would have to walk away.

I absolutely love being brutally honest.
Lying damages trust, and credibility,
I also considered it to be cowardly.

Cheating is having a unfair advantage over your oponant.