Caught wife cheating…?

i had a suspicion that my wife was cheating on me and tonight, she finally admitted it
now i also cheated on her before, so i intialy decided to do nothing since we’re even and for the sake of our 5 year old son

however, i only cheated on her once, but she might have cheated on me twice or more and that wont be fair to me since she cheated more than i did
if she had two or more affairs, im planning on leaving her

is there any way of making sure if she really only had one affair?

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