What is he folding here, AK/AQ type of hands? You've three-bet him a lot, he's only called once...well twice if you include this 4-bet...he's obviously not 4-betting light. I think he was trying to C/R the turn and will insta-call your push. Why? Because if you have AA/KK you're not gonna call the 4-bet pre, call the flop bet and push the turn to a check...you want value and you don't need to push to create it...he's pretty much gonna call you down for reasonable sized bets hoping to hit AK if that's what he has. If he has AA/KK, you're screwed. QQ/JJ might think about it but it smells like a bluff so they call out of curiosity.

What could he have? AK is an auto c-bet on this flop, and so is your call. AA-QQ check the turn to induce a bet, which again is almost auto if you put him on AK/AQ. JJ leads out again to protect their hand...too many overs to worry about. Everything else is NOT in his range. You may fold JJ/AK/AQ but that's about it. AA-QQ are definately calling and AK/AQ is behind so you want him in.

You're line just doesn't make sense so you make it hard for him to lay down a semi-decent hand in this spot. Raise the flop, push the turn and he may fold QQ/JJ here more often, but I just don't feel AA/KK or set from your line.

I'm busto though so what do I know.