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What @Sparky said, it's still yours. If you reported it to the police as stolen at the time, have a crime ref number and the bikes serial#, should be pretty easy to get back.
I know it's hard to without feeling like a dick as giving the guy the benefit of doubt that he bought it legit, and you are leaving him without a bike, but he can take it up with the seller, I'm sure the police would help him...
Interesting cycle to work this morning. Came across someone cycling my bike that was stolen from me a few months ago. Chatted to them and at a stalemate. Now wondering whether I will get it back and how.