I get the "don't sweat the small stuff" comments to try and help put things in perspective. But, OP has a right to be pissed for a few days at least. I'm also someone that believes that when you give you word it means something. That's why the world is so screwed up. People forget what manners and being a decent human being are all about. Its all me, me, me. Ticks me off when people can't even hold the door open when you're walking behind them or don't walk a little faster when crossing the street when you're waiting. Entitlement. Just sad.
I've had good experiences in this hobby for the most part because I like to talk to the person before I commit to a deal to increase odds of them being a straight shooter. So far only one deal not so good. Sorry this happened. There are still many of us honorable types around.