You should have listened to my feedback on that guy--it was pretty much known he was trying to scam from the get-go. You have to be extra careful with PayPal. Don't be stupid next time.
I'm assuming you think OP paid with bitcoins, but from his post history it appears that he was buying BTC with PayPal.
https://bitcointalk.org/index.php?topic=1672944.msg16798074#msg16798074I'm pretty sure you can still dispute a gift transaction.