Look at it from his side...

He has AQ suited, he raised a little telling everyone he has "something"

Flop comes KJT giving him the nut strait AND a nut flush draw. (I'm guessing this from your post)

He leads out with a min bet (showing weakness) hoping someone will jump on him... which you did.

Turn comes and gives him the flush he's been dreaming of and he tries to be nice and just get the money in the pot by making a pot sized bet, but instead you think he's full of it and raise over the top of him. So he says to himself, fine I'll take your money, and goes all in. Then you promptly say sure.. here you go.

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Respect the board, when it tells you there is a strait and a flush possibility, you better have a good reason to think someone is bluffing before you put your money in the pot with only 2 pair.

[edit] sorry.. I somehow read flush in your post.. wasnt there.