Small PP's hate me

Party Poker 1/2 Hold'em (9 max, 8 handed) FTR converter on zerodivide.cx

Preflop: Hero is MP1 with 5[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/heart.gif[/img]. CO posts a blind of $1.
UTG calls, <font color="#666666">1 fold</font>, Hero calls, <font color="#666666">1 fold</font>, CO (poster) checks, Button calls, <font color="#666666">1 fold</font>, BB checks.

Flop: (5.50 SB) K[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, UTG checks, <font color="#CC3333">Hero bets</font>, CO calls, Button folds, BB calls, UTG calls.

Turn: (4.75 BB) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, <font color="#CC3333">Hero bets</font>, CO calls, BB folds, UTG calls.

River: (7.75 BB) 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">CO raises</font>, UTG folds, <font color="#CC3333">Hero ????</font>

At this point, I am starting to wonder exactly what CO might have. The whole table was constantly changing, and it seemed like players were dropping out and in and furious rate. CO was loose (58 VPIP) over 20 some hands... I had already popped him with a set of K's one circuit before, then sat out and called me names for not raising preflop with KK (Which was a misclick, not some sort of dumb trap). Any comments/criticizms appreciated.