Opponent goes from check/calling on the flop to lead betting on the turn. He's almost certain to have made a flush/trips. If he had the Q though I'm suprised he wouldn't lead bet it on the flop with that board. He should be betting just about any made hand on the flop rather than give somebody else's flush draw a free card. He may just be betting the scare card as a bluff on the turn, but I'd say this is a fold for you here.