AQ reraised pot, line check. 600NL

[jj12]

Effective stacks $509.

Villain (27/9/4 over 90 hands, no special reads) raises UTG to 18, I three-bet AhQh from the BB to 66, he calls.
Flop is A[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] (pot $135)
I c/c a $54 dollar bet.
Turn is 5[img]/images/graemlins/spade.gif[/img]
I check, he instapushes (389 into 243 pot), I fold.

How's my line? I was planning on valuebetting smallish on turn and river if he checked through. I think that if I bet and get raised on this flop I have to fold, but it would be a very close decision. So I decided to check to avoid a flop raise.