Turns out, Gary was 'a nice bloke' (as Andrew put it) after all. After he collected the bids and called me, one of the people who had declined to bid higher than my bid changed her mind. She called to tell Gary that she had changed her mind and was willing to pay $100 more than his highest bid. Gary said, "I can't do that. I already told them they have it."
The woman wanted it badly and tried to debate. Gary told her that he had been very clear when he spoke to her the previous day. It was too late to change her mind.
If he had changed his mind, it would have broken my heart. I told him so.
"I knew it," he said.