We’re not lawyers, nor do we pretend to be, however, our senses tell us that depending on the contents of the letter they could make a case of harassment against you. A threat is just that - an act meant to make someone live in fear. I’d just leave it (and him) alone and hope they feel that your threat is idle.
Life’s to short to give one person this kind of control over your emotions. Let it go, so many better guys out there.
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