[JustToast]

I understand not betting the turn for pot control, but I think a turn bet might get you the information you want (if he raises, you can fold). It's a tight spot, but your turn check makes it a toss up whether he's bluffing or has a hand.

Plus if he has something big he might try to checkraise the river if you bet the turn (check behind, of course). If he calls the turn and leads the river with a solid bet, you can happily consider yourself toast and check out.