Hey mate i think you played it ok - i would think about a continuation bet on the flop as he would probably drop his hand. He knows you are strong and he doesnt know the Q doesnt help you. Once he bets big on the river he either has something or has completely missed his draw and wants you to fold. Once the diamond draw hits on the turn he isnt going anywhere. I think you played it fine and i dont think there is anyway you can put him on a 2 so you just have to pay him off unfortunately. But yeah would definetely c-bet that flop :)