Sorry I misunderstood. In that case, cheating definitely hurts more I would say. It’s more of a betrayal then a break up imo. Its a bit like the difference between having 10$ stolen and losing 10$, or the difference between scratching your car on a branch and having someone key it. Depending on the person’s social circle, it’s a lot more humiliating being cheated on.

There’s also stds or just the fact that your significant other might have slept with someone else a few hours ago and then climbs in bed and has relations with you right after. And we are talking about 20 years of marriage in this case, I can’t imagine how disrespectful it must feel.