You made him pay to beat you on every street. He caught up on the river. Just part of the game. He was not getting the right price to make that draw based on your betting. Just part of the game.

The question is what if he re-raised you on the river? Do you fold...hmm?

Only thing you could do was push AI or bet larger on the turn to blast out the flush for sure. However TPTK is a tough hand to do that unless you have a good read because you can't rule out a slow played set or 2 pair.