You got BS'ed. Plenty of good people in this hobby, but plenty of BS'ers too. Going to hit one sooner or later if you buy and sell enough... sorry to say. "I need the Elgin Bluebird ornament to complete my otherwise perfect blue bird..." and the usual sob story. Then suddenly, charky turns around and tries to pull a $150 profit over what you sold it to him for because you feel bad. It happens. You learn not to sell to these clowns.
And then there are some people in this hobby who, when you talk to them, you can just tell they like bike crap but have stuff wrong in the head. People who have six Elgin Bluebirds but piss themselves silly at night and haven't had a date since 1981. They exist...