Does An Agent Representing Buyer & Seller Have To Disclose ?

[Zana Blue]

I listed with an agent and he brought me a buyer and we signed a contract. He kept adding more concessions on for me to fulfill that the "buyer" demanded. Now I FINALLY find out he is acting as a I think they are called transactional agent and representing me the seller and the buyer. He never disclosed this to me and I certainly would not have shared all the financial details I did with him if I had known they were being broadcast to the buyer. I guess it is a gray / grey area but I think an ethical agent would disclose if they are acting as buyer and sellers agent !