Does your flop check really loosen his turn call range that much? I could see many hands folding the turn that are ahead of you myself, maybe I really am too weak-tight? Then again maybe I'm too predictable. In a spot like this I usually figure my opponent has checked twice so he wants to give me the pot, I have pretty much crap myself and with that draw heavy board if he wants to give me the pot now then I'll gladly take it.