It goes the other way too. I have been holding a grudge for like 5 years..... Guy is interested in a low tier game I am selling. Back and forth an if he wants it. One day I get the message "I will take it!"
I say no to another guy because in my mind I have a virtual handshake. Then a few days later when he is supposed to pick up " my wife won't let me go through with it, sorry.". I ended up selling for the same price a few weeks later but I still think of it every time I see the guy at a show. Wow, it does feel better to vent