I would probably play this the same way. He bet into you on the flop and the turn after your 3 bet. I would have to think that he either flopped the K or made the flush on the turn. Either way I think you're behind and drawing very slim.
The question what to do is very hard to answer without having some reads on what hands he donk bets here. He is probably going to check-raise a monster so he might have some weak made hand. You are still head of many Ax hands, as well as worse pocket pairs so you can argue for calling down.
But you might find a fold against certain opponents.
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