kk monotone board 6 max

[george w of poker]

villain is relatively unknown. he's been raising a bit much post flop and taking it down so he could be getting out of line but I don't have any solid proof. is this a standard fold with the call behind me?

Party Poker No-Limit Hold'em, $ BB (6 max, 6 handed) converter

Hero ($200)
Button ($420.94)
SB ($211.10)
BB ($190)
UTG ($312.08)
MP ($75.45)

Preflop: Hero is CO with K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $1.
<font color="#CC3333">UTG raises to $4</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $12</font>, Button calls $12, <font color="#666666">2 folds</font>, UTG calls $8.

Flop: ($39) 3[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">Hero bets $30</font>, Button calls $30, UTG pushes $300, Hero folds