Sadly enough, and I hope I'm wrong; but I think you lost your BTC...
You are not wrong he has lost his btc as it has been scammed.
This user has blocked me on telegram and whatsapp. Not responding to my messages anymore. He has scammed me for 0.0288 BTC.
You could save it, if you use escrow, never make a trade with a low ranking person or who has almost no trading experience.