TPTK 3 way pot

[Stalrock]

Poker Stars
No Limit Hold'em Cash Game
$0.50/$1 Blinds
6 Players - (LegoPoker Hand History Converter)

SB: $101.00
BB: $100.00
Hero (UTG): $99.50
MP: $104.30
CO: $125.25
BTN: $106.60

Preflop: Hero is dealt A[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/club.gif[/img] (6 Players)
<font color="red">Hero raises to $4.00</font>, MP calls $4.00, CO calls $4.00, 3 folds

Flop: ($13.50) A[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/club.gif[/img] (3 Players)
<font color="red">Hero bets $9.00</font>, MP calls $9.00, <font color="red">CO raises to $25.00</font>, Hero calls $16.00, MP folds

Turn: ($72.50) 2[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $30.00</font>, Hero folds

I didnt know what to do on the flop, so I just called. I evaluated the size of his turn bet and it scared the **** out of me so I folded. What do you guys think?