I'm weak - AQ top pair, check-fold turn?

[cbloom]

Another dilemma on the turn. Villain is pretty solid, and will attack weakness. Again I feel like checking the turn is just giving the pot away, but betting again is spewing if he has AK or a set ? When he calls the flop is that it, I give up? I feel like I've got a pattern where I bet the flop, check-fold the turn, and good players pick up on that, but maybe I'm just paranoid.

Party Poker No-Limit Hold'em, $ BB (9 handed) internettexasholdem.com

CO ($128.10)
Button ($43.25)
SB ($62)
BB ($54.21)
UTG ($100)
Hero ($103.55)
MP1 ($87.25)
MP2 ($99)
MP3 ($83.85)

Preflop: Hero is UTG+1 with A[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $0.50. UTG posts a blind of $1.
UTG (poster) checks, <font color="#CC3333">Hero raises to $5</font>, <font color="#666666">1 fold</font>, MP2 calls $5, <font color="#666666">3 folds</font>, SB (poster) calls $4.50, <font color="#666666">1 fold</font>, UTG folds.

Flop: ($17) 7[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $15</font>, MP2 calls $15, SB folds.

Turn: ($47) 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP2 bets $40</font>, Hero folds.

Final Pot: $87