Seems that the guy has a history of scamming. I saw a scam accusation thread posted last November 2016 here "Cruguy is a scammer!", and the OP even left a negative feedback to him [trust page]. Too bad he wasn't tagged by a DT that time. Since you can't get your BTC back, just learn from it and be extra careful next time. Always check the trust page before dealing, and would be better if you use an escrow.