What fiduciary duty did Kai violate when he disclosed Rick's desperate situation without consent?

The fiduciary duty that Kai violated is confidentiality. In real estate and other professional relationships, confidentiality obligates the agent or fiduciary to keep sensitive information about their client private unless given explicit permission to disclose it. By revealing Rick's desperate situation without obtaining his consent, Kai breached this duty, as he disclosed personal and potentially damaging information that could affect Rick's standing or position in the market or personal life.

Maintaining confidentiality is crucial for building trust between the agent and the client, as it ensures that the client's private matters remain secure. Violating this duty can lead to significant repercussions, both for the trust in the agent-client relationship and potentially for the client's financial or emotional well-being.