[Requin]

I'd fold. Villain is not betting a worse made hand on the river, he'd c/c. Basically all you beat is a bluff, and given the flop call he always flopped something, so he never has total air. He isn't calling the flop with the bare Kh even (unless he's awful). So you beat pretty much only an Ah that decided to play fairly passively, and now wants to bluff.