I had the exact same thing happen to me just a while ago,but it was for a trade.
We made a 100% deal that was fair as fair could be. He was out of town for work,so I had to wait a week for him to get back home to ship.
I even pulled the knife he wanted out of the forsale thread it was in.
Then when this guy finally gets home from work.
He bold faced lies to me saying his "wife" wouldn't let him trade me.
Then I come to find out that he Traded the knife his wife said he couldn't on another forum.
After we agreed 100% on a deal, after I pulled my knife from the sale thread it was in, and after I waited the week for him to get home.
So I called him out on it, and he's like "well lets do another deal for another knife"...I was like Ya right buddy get bent!
I wont drop his name here, but if you wanna know who he is so you'll know to steer clear of him, just shoot me an email and I'd be happy to help you out.
I don't know whats wrong with people these days. But back in the day a deal was a deal,especially when you gave your word that it is.
When a man gives you his word,his word should be bond!
because In the end all a man really has is his word.