This happens all of the time!

I was thinking the bet on the Turn signalled a flush and so I folded. Just so happens that my 2pair gets completed on the river. How could I have prevented this, or what could I have done differently, or what did I do wrong??

PokerStars 0.10/0.20 Hold'em (5 handed) FTR converter on zerodivide.cx

Preflop: Hero is BB with 6[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, MP calls, <font color="#666666">1 fold</font>, SB completes, Hero checks.

Flop: (3 SB) K[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, MP checks.

Turn: (1.50 BB) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, <font color="#CC3333">MP bets</font>, SB calls, Hero folds.

River: (3.50 BB) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">MP bets</font>, SB calls.

Final Pot: 5.50 BB

Results in White:
<font color="white"> Seat 1: lucik (small blind) showed [5d 5s] and won ($1.05) with a pair of Fives
Seat 7: DON27 showed [As 2c] and lost with high card Ace </font>