[milesdyson]

i don't think the flop is standard. you said he hasn't gotten out of line - well he just 3-bet your utg preflop raise. none of his 3-betting range is folding to the flop check raise. AA/KK/QQ/JJ/TT/99/88/AK/AQ.. the overcards have made gutshots and the pot is large enough for him to not fold them. you're basically forcing him to either punish you with good overpairs/sets or call correctly with the best high card hand.

but you did c/r the flop - so now what?

his turn check means he has 99 or AK/AQ (or he is scared of the flush and has decided to let you bluff at the end). i think you have to bet this river to get him to fold.