Is there any recourse if there a boss breaches confidentiality about a conversation about coworkers?

I had a confidential conversation with my boss about colleagues. I asked before beginning of it was a safe environment and that it would be held in confidence and never leave the room. It was agreed. My boss did talk about what I said to other people and eventually it made it back to the person. That person was then hired to be my immediate boss fully knowing about the conversation. I am stuck working in this situation and I don’t know what to do. I am being silently treated very badly as punishment.