Sorry to say, but it looks like you've been scammed 
Bitcoin has the same irreversible properties as cash, buyer beware. Hopefully it was not too hard a hit for you. Buying high-value items with bitcoin is a little silly since there is no buyer protection. Better to use a "seller-beware" form of payment (pp, cc) unless you are down with goods that fell off the truck, but then you got to trust the buyer. Not recommended without escrow at least!
Bitcoin has the same irreversible properties as cash, buyer beware. Hopefully it was not too hard a hit for you. Buying high-value items with bitcoin is a little silly since there is no buyer protection. Better to use a "seller-beware" form of payment (pp, cc) unless you are down with goods that fell off the truck, but then you got to trust the buyer. Not recommended without escrow at least!
He thought he was using an escrow, but obviously the escrow was the seller ...
You can not do anything. You can go to the police, but they will never find the guy (probably not even in your country btw).
Sorry for your loss...