I get stood up when selling second-hand stuff online

I got stood up this week by an adverts.ie buyer. I was gutted. I had practically been waiting for them in the hall with the sander. (That is not some sort of niche kink. All visitors don’t get a rub of the sander. I was selling a sander.)
And then the message came. “Sorry withdrawing my offer”. How DARE he string me along? I was looking forward to that €15 and the one or two cubic feet of space that would be freed up. Well, for your information “baggytrousers15” (not his real pseudonym) I was messaging someone else all along and they emptied the space in my heart.