Dealing estate in vain

The dealing estate for my son's new house has broken off the other day. The price we presented was exactly the same as that of the recommendation price by the seller's real estate agent! But, the seller insisted 2,000,000 yen higher one, so the result was that. The agent has enough information about current market price and they served the price to the seller, of course that is nothing but the higher price seller concessions advantage, and the dealing should go well with buying and selling established, our price is more reasonable than ordinary dealing without any price cut negotiations. The seller suspected the secret agreement between the agent and us, because the prices were the same from a common-sense standing point of view. Any way, all the the efforts exerted this time were in vain. Becoming emotional is worse for a big dealing, not for us but the seller.