You can request him on his website bitmarket.eu to pay back ~10% of the amount you lost. 10% of 22 BTC is ~2BTC is ~2k EUR. Enjoy.

(I don't want to talk down the incident but I think it is also our fault to trust a single person to keep the Bitcoins save... I lost all my BTCs this day because I was too lazy to set up a local wallet. I used the market as an online wallet and failed.)