Why did I fold? Would anyone else?

[bleu329]

Party Poker 15/30 Hold'em (10 handed) converter

Preflop: Hero is SB with J[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/heart.gif[/img].
UTG calls, UTG+1 calls, <font color="#CC3333">UTG+2 raises</font>, MP1 calls, <font color="#666666">4 folds</font>, Hero calls, <font color="#666666">1 fold</font>, UTG calls, <font color="#CC3333">UTG+1 3-bets</font>, UTG+2 calls, MP1 calls, Hero calls, UTG calls.

Flop: (16 SB) 2[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Hero bets</font>, UTG calls, <font color="#CC3333">UTG+1 raises</font>, UTG+2 folds, MP1 folds, Hero calls, UTG calls.

Turn: (11 BB) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG raises</font>, UTG+1 calls, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">UTG caps</font>, UTG+1 calls, Hero calls.

River: (23 BB) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">UTG bets</font>, <font color="#CC3333">UTG+1 raises</font>, Hero folds, UTG calls.

Final Pot: 27 BB

Results in white below: <font color="#FFFFFF">
UTG has Kc Js (two pair, kings and jacks).
UTG+1 has Ad As (two pair, aces and fives).
Outcome: UTG+1 wins 27 BB. </font>

Can I really fold the best hand here? I thought UTG had higher flush and UTG+1 made kings full on river - does anyone else fold here? How about folding on the turn? or did I play it well until the river? or was it a good river fold? so many questions...on a stupid hand - BTW I was playing on a little tilt and left shortly after this hand..