Privacy Act violation?

I am a Federal Employee. In the middle of a divorce. My supervisor released a copy of an Official "Letter of Admonishment" containing Personel information about me, including Name, Position, etc, in all a three page document on Official Government Department Letter head, without my knowledge or permission to my soon to be ex-spouse. My supervisor and wife are personal friends. I have a copy of the email asking for the document and a copy of the document that was sent. Is this a possible violation of the Privacy Act of 1973?