Folded best hand.. correct to do so?

[Withen]

MP3 was loose passive, but with a high PFR (15%). I decided I was behind whem 3-bet on the flop, was I correct to check-fold on the turn? Who calls this down?

Party Poker 2/4 Hold'em (10 handed) converter

Preflop: Hero is BB with 8[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, MP1 calls, <font color="#666666">1 fold</font>, <font color="#CC3333">MP3 raises</font>, <font color="#666666">3 folds</font>, Hero calls, MP1 calls.

Flop: (6.50 SB) 3[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, MP1 checks, <font color="#CC3333">MP3 bets</font>, <font color="#CC3333">Hero raises</font>, MP1 calls, <font color="#CC3333">MP3 3-bets</font>, Hero calls, MP1 calls.

Turn: (7.75 BB) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, MP1 checks, <font color="#CC3333">MP3 bets</font>, Hero folds, MP1 calls.

River: (9.75 BB) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
MP1 checks, MP3 checks.

Final Pot: 9.75 BB