If it was a new offer, then you have no obligation to the original agent -- with one exception:
Paragraph 5.B.(2) provides that the broker is entitled to a commission if: "Broker individually or in cooperation with another broker procures a buyer ready, willing, and able to buy the Property at the Listing Price or at any other price acceptable to Seller."
Assuming that the new offer was for the identical listing price, then the agent could claim that you intentionally rejected the original offer in order to deprive the agent of his/her sales commission. Proof of that would be a breach of the original contract and entitle the agent to the sales commission.
That could be a difficult proof. But, I'm mentioning this possibility to be thorough.
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