Is it ever right to cheat back for the sake of revenge?

I heard a story about that. It goes like this:

- A gets caught cheating (in the act) and is remorseful.

- B breaks up but then reconciles and they worked it out.

- Years later they get married and have kids.

- B suddenly cheats for revenge, feels nothing for the affair person.

- B at least confesses to it and stops the affair

They're both even. Is it ever right to cheat back? What if it's out of just revenge and you're even using the affair person, feel nothing for them?

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Is it ever right to cheat back for the sake of revenge?
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