My wife admitted to having a one night stand with a coworker 10 years ago. She says it was a mistake and has been the only time?

It may be old to her and she may be over it, but it’s new to me. Am I entitled to do the same? I have an opportunity with a female friend who I have chemistry with, but I’m not sure if I will feel better, or worse.
My wife admitted to having a one night stand with a coworker 10 years ago. She says it was a mistake and has been the only time?
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