A8s how did I play this?

[Pyro12345]

What have I done wrong here?

Party Poker 0.50/1 Hold'em (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is MP3 with A[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/heart.gif[/img].
<font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">2 folds</font>, SB calls, BB calls.

Flop: (6 SB) 6[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, SB calls, BB calls.

Turn: (4.50 BB) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, BB folds, Hero calls.

River: (6.50 BB) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, SB calls.

Final Pot: 8.50 BB

[Gib]

What do you put SB on at the turn? If he is passive do you think he just hit 2 pair &amp; decided to donk it? I'm not sure on your read on this guy but I'm folding the turn donk if he is LPP. I dont think it's a very good idea to value bet that river.

[Edit: btw, PF is perfect]

[MrWookie]

Preflop is fine. Flop is fine. Turn, eh. Calling is OK w/o a read, but a slight read towards passive would push me to fold. River bet is terrible.

[TredWel]

PF/Flop are fine. Turn is a very interesting scenario. I think I have to at least call down, because the chance that he's betting a weaker 8 or a flush draw is too great to just give up now. I think raising costs us too much, though, since he's liable to fold hands that we beat and 3-bet us with hands that crush us. So I call the turn bet. When the fourth diamond comes, I check behind, expecting to see that SB made a low flush on the turn.