A9o in the CO gets reraised - passive line?

[ninenine_zoe]

villain seemed to be somewhat reasonable.(he actually is 28/13/2 after 38hands).
i was trying to isolate a lot (maniac and fish to my right/maniac has just left the table), running poorly and showed down UI overs once in a while. dont know if villain noted that.

Cryptologic
Limit Holdem Ring game
Limit: $ 2/4
5 players
Converter

Pre-flop: (5 players) Hero is CO with A[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/diamond.gif[/img]
UTG folds, <font color="#cc0000">Hero raises</font>, 2 folds, <font color="#cc0000">BB 3-bets</font>, Hero calls.

Flop: A[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/club.gif[/img] (4.5SB, 2 players)
<font color="#cc0000">BB bets</font>, Hero calls.

Turn: 7[img]/images/graemlins/club.gif[/img] (3.25BB, 2 players)
<font color="#cc0000">BB bets</font>, Hero calls.

River: 3[img]/images/graemlins/club.gif[/img] (5.25BB, 2 players)
<font color="#cc0000">BB bets</font>, <font color="green"> Hero ?</font>

i decided simply to call him down. then the board became more and more ugly. comments on all streets welcome.