I never knew that Paypal FF is irreversible. I am sorry for your lose. You should not send FF first neither the scammer too. When a user do not have much rep here, it's always advisable to use escrow.

Archive: http://archive.is/xnrWN

I will tag the guy and I hope he leaves this kind of scamming profession.

Edit:
Tagged

Edit:
Archive updated: http://archive.is/AKtJW