Thanks for your question. I think you shoudl consider having a lawyer write him a letter demanding return of the tape and threatening with civil suit if he discloses the tape to anyone. You have legal rights and remedies in this situation.
A lawyer may be able to get the tape back and put him on notice here. Your lawyer could also file suit here if he makes this public. This is a good claim here. Sometimes if he was a homeowner he would insurance coverage for such a situation. Either way this would protect you here from disclosure or get you money if he does it. Good luck here..
Lawyer
25 years in civil, criminal, family, probate, elder issues, and administrative law