River action against a TAG...

[SparkyDog]

Villian is a little too loose preflop and was sporadically aggressive preflop. There were a few hands I saw him play that he definitely should have raised preflop, but postflop he keeps the pressure up. Earlier this session he played aggressively in position with 88 on a T52 board; raising the turn after I 3bet the flop with T9o. I called him down. He didn't raise 88 preflop though. Anyhow, on to the hand.

Party Poker 5.00/10.00 Hold'em <font color="#0000FF">(6 handed)</font> link

Preflop: Hero is BB with 5[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 folds</font>, CO calls, <font color="#666666">1 folds</font>, SB completes, Hero checks.

Flop: (3.00 SB) 5[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, CO calls, SB calls.

Turn: (3.00 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, CO calls, SB calls.

River: (6.00 BB) 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">CO raises</font>, SB folds, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">CO caps</font>, Hero calls.

Should I have 3bet this river? Who wants to give a percentage for how often I'm winning this once he caps?