hmm. I might be inclined to 3-bet this flop. The river check is a strong indicator that he didn't make his flush draw, but you said he was a calling station. I am thinking a river bet/fold against this type of villain. I suppose he might call with a hand that beats us and he has checked fearing we have a straight. It depends if this is a lo-aggro calling station or high-aggro. Now I'm thinking maybe we should fold the turn in this pot.