Can a realtor show a buyer a different property if the buyer is already in a contract for another property?

Question Details: We had a buyer for our home and were negotiating terms after an inspection. Both buyer and seller signed the contract and the buyer asked us to do certain repairs. The contract stated that we had 72 hours to respond to the buyer. During that 72 hours the buyer was shown a different property and they proceeded to walk away from buying our house before the 72 hours was completed. The buyer broke the contract we had with them before the 72 hours was us. They have put an offer in on the other property. Did the realtor break any ethics laws? The realtor represented both of us as a dual realtor.

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