That's the thing, did he back out? Coming on the forum and accusing a seller of reneging on a deal is a substantial allegation, especially if you don't know for sure if they have done so. Things like that can damage someone's reputation. Just because he didn't respond at 3 am , doesn't mean has has backed out. I can think of a long list of reasons someone might not respond at that time of the night. If he doesn't get back to you in the next 24-48 hours, then you might have a case. Short of that, you just need to learn a tiny amount of patience. Good luck to you, and him. Hopefully you two can get it worked out.