I mean that the only person who can decide if they forgive cheating (or any other thing) is the person who has been cheated on. It is a personal decision and the cheater has no right to be forgiven. If the cheater is forgiven it is a chance, opportunity or gift the cheated on a person is offering. But the cheated-on person can as well decide not to offer that opportunity. Is an extra, not something the cheater can count on, it is not owed.

And the fact that one person or many people forgive cheating doesn't mean that another person has to forgive.

That idea that you should forgive that turns it into a thing that is owed is unfair. Saying that you are sorry doesn't entitle you to the other person accepting such apologies and acting as if the damage never existed or being forced to work on fixing things. They can do it, but they have no obligation to forgive.