Is it common for a former cheater to be more forgiving if they got cheated back?

Anonymous

Person A cheats on Person B.

B forgives A. Then several years later, B falls into temptation and cheats for different reason. A forgives more easier and quicker.

https://www.reddit.com/r/survivinginfidelity/comments/z1db6o/i_cheated_in_the_past_but_was_it_still_a_mistake/

The lady cheated first when she was 19 way back in 2002. He was her boyfriend at the time. They worked it out and we've been long married. He cheats this year and she's more forgiving than he was at the time. This is one of her replies:

My cheating was completely my fault. Nothing my boyfriend ever did nor even our argument was an excuse for what I did.

I always wished I could build a time machine and fix everything. How do you think I've been willing to work with a marriage counseling after my husband confessed his cheating? I owe him one after all. I know what it feels like to be him cheating and being contrite about it. When he took him back at the time, I did made a promise to myself that if he ever cheated, I would work it out too.

Updates
1 y
The woman is now 39 years old. When she was 19, she cheated with the guy's best friend. She feels she owe him one and so takes him back when he cheats 20 years later for different reasons.
Is it common for a former cheater to be more forgiving if they got cheated back?
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