The CAR form DA (Disclosure and Consent for Representation Of More Then One Buyer or Seller) completely addresses the issue brought up by the poster. You can go ahead and sign a confidentiality agreement with your agent to give yourself additional protection. I have ran into cases where I have showed different parties the same home and even had multiple parties make offers on the same home. In all those cases I told the clients before hand if I had already put in another offer for a different client so if they were uncomfortable they could work with another agent.
