UTG hand misplayed

[Shack]

$0.50/$1 Pot Limit Omaha Hi - 6 players

BB: $97.50
UTG HERO: $103.20
MP: $213.65
CO: $100.40
Button: $77.95
SB: $165.05

Preflop: Hero is UTG with 9[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img]
Hero calls $1, MP folds, CO folds, Button folds, SB calls $0.50, <font color="#FF0000">BB raises to $4</font>, Hero calls $3, SB folds.

Flop: ($9.00) 5[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#FF0000">BB bets $6</font>, Hero calls $6.

Turn: ($21.00) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#FF0000">BB bets $12</font>, <font color="#FF0000">Hero raises to $42</font>, <font color="#FF0000">BB raises to $87.50 (all in)</font>, Hero calls $45.50.

River: ($196.00) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>


Final Pot: $196.00 <font color="white"> BB showed [4c Qc Ah Ac] and won ($193) with three of a kind, Aces </font>


I knew nothing about my opponent. I decided I wanted to see his action on the turn so I called the flop. Then I thought he might be weak, but was wrong and committed myself to the pot. comments?