BB KK into a 3 way flop.. grumble!

[Chrysiptera]

Unfortunately this only my 2nd orbit at the table so my
reads were useless...

I'm feeling like this was a good fold, but it hurt to do.. thoughts?

Poker Stars
Limit Holdem Ring game
Limit: $0.25/$0.5
9 players
Converter

Pre-flop: (9 players) Hero is BB with K[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/diamond.gif[/img]
UTG folds, <font color="#cc0000">UTG+1 raises</font>, MP1 folds, MP2 calls, MP3 folds, CO calls, 2 folds, <font color="#cc0000">Hero 3-bets</font>, UTG+1 calls, MP2 calls, CO calls.

Flop: 8[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/diamond.gif[/img] (12.4SB, 4 players)
Hero checks, <font color="#cc0000">UTG+1 bets</font>, MP2 calls, CO folds, Hero folds.