LP player bluffing me?

[Womble]

PokerStars 2/4 Hold'em (6 handed) converter

Preflop: Hero is BB with 9[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img].
UTG calls, MP calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Button raises</font>, <font color="#666666">1 fold</font>, Hero calls, UTG calls, MP calls.

Flop: (8.50 SB) T[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, UTG checks, MP checks, Button checks.

Turn: (4.25 BB) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, UTG checks, <font color="#CC3333">MP bets</font>, Button folds, Hero calls, UTG calls.

River: (7.25 BB) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, UTG checks, MP checks.

Final Pot: 7.25 BB

The turn didnt really help anyone although the better was a LP (60% VPIP and around 0.7 agg). I thought that either we were splitting or I had 6 outs to improve.