3/6 So... you push? Sucks, kinda

[Panny1]

Party Poker, $3/$6 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

SB: $140.65
BB: $407.80
UTG: $526.35
MP: $630.95
Hero (CO): $624.50
BTN: $226.15

Pre-Flop: 5[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/heart.gif[/img] dealt to Hero (CO)
UTG calls $6, MP folds, <font color="red">Hero raises to $27</font>, 3 folds, UTG calls $21

Flop: ($63) 7[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img] (2 Players)
UTG checks, <font color="red">Hero bets $48</font>, UTG calls $48

Turn: ($159) 6[img]/images/graemlins/spade.gif[/img] (2 Players)
UTG checks, <font color="red">Hero bets $120</font>, UTG calls $120

River: ($399) 4[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">UTG bets $331.35 and is All-In</font>

Villain was a super nit pre, 16/6, but super aggro on Turn/River, 7/oo. Barely any history between us.
fwiw he instcalled Flop/Turn and almost instapushed the River.
A 3/8 is in his Range here like, never?