Yup, just something you gotta deal with when you have people that are interested in getting something but are completely non committal about it haha, I'm guilty of a couple times emailing then talking myself out of it, but I'll follow it up saying I'm no longer interested.
My sister has a knack for breaking/losing phones so for Christmas 2 years ago I found a Samsung galaxy s3 or 4 for sale in Brantford for a good price, so I jumped on it, called him Sunday evening and said I could be there after work on Monday evening around 6 and he had my number if anything were to come up. So I head to his house knock on his door (pimple faced kid shows up to the door, maybe 18) say hey I'm here for the samsung and he just says "oh yeah I sold that earlier today"
Wow was I livid, I tore him a new one he was backing into his house and looked terrified, I think he filled his pants lol. Hopefully he learned his lesson and doesn't do it to anyone else