You can be polite but if you ever have any financial transaction with him again it's on you. Life's too short to hate but that doesn't mean you have to forgive or forget. Been in a deal or 2 like that myself and never saw many changes in the other person. Once a con/thief, always a con/thief. Just that now you are aware of problems and can prevent further loss.
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An armed member of society is a citizen, an unarmed member is a subject.
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