What would you do if you found out your spouse was cheating on you with the person who had your same exact first and last name?

Like would if found out your wife or husband cheated on you with a person who had the same exact name as you?

You

also found out that they look exactly like you too?

I'd leave
I'd stay since they had had the same exact name as me and the person they cheated on me with looked exactly like me too. They would get a free pass.
Some other answer
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What would you do if you found out your spouse was cheating on you with the person who had your same exact first and last name?
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