I'd pot the flop. You want to get money in there and on this board if he calls 2 he'll call 3.

I wouldn't worry so much about the straight possibilities on the turn. Sure, he could have called your flop bet with QJ since that's 2 overcards to go with the gutshot. But this is unlikely and his turn bet is weak. Raise it.

Then of course at least call river. It's a blank. He wasn't drawing to runner-runner flush -- he only has it if he backed into it by accident with JT or J9 of spades or something. Should you raise river? This I'm not sure of.