2/4 Big Blind...misplayed?

[Finch]

I'm a little uncomfortable after a flop when I have an awkward hand like middle pair or weak draws. For instance...

Party Poker 2/4 Hold'em (9 handed) HandConverter Link

Preflop: Hero is BB with 9[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls, <font color="#666666">3 folds</font>, CO :#A500AF(Villain)/ calls, <font color="#666666">2 folds</font>, Hero checks.

Flop: (3.50 SB) A[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, UTG+1 folds, <font color="#CC3333">Villain raises</font>, Hero calls.

At the flop I was thinking: I intend to call a bet here, so I should bet at this and give the other two a chance to fold. My read on the villain tells me that he will raise in this situation with any top pair. I put him on an Ace and decided to fold the turn UI.

Turn: (3.75 BB) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Villain bets</font>, Hero calls.

I think my call on the turn is what is bothering me. I saw the shiny new flush draw and counted up something like 13-14 outs. I didn't really allow for the possibility that my 9 isn't the largest diamond still in play. Looking back at it, this call seems to me like a player looking for a reason to stay in the hand [img]/images/graemlins/frown.gif[/img]. I need to fold this, right?

River: (5.75 BB) A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, Villain calls.

Now that I've hit, I can't give him a free showdown.

Final Pot: 7.75 BB

Any and all comments are appreciated.