First off all i feel bad for your loses,and when you make a deal with him ?
because seems like he's a scammer based on his trust,asking for loan and without solid collateral or no collateral.
and you didn't tell him or the escrow to hold your money before you're checking the item ? many people doing that because not a only you,many people got scammed before similiar to yours.and that's why the buyer and seller should make a deal that the payment will be send if everything is okay.
Ok,everything has been done and nothing changed even if you're mad,learn from your mistake and in the future if you're buying something make sure to make a deal with him 'No item No Payment'
PS : By the way where is the payment proof?