NL50: Nut flush on turn, board pairs on river (nr 1)

[AlexB182]

So I just had my worst session of poker ever so far and I have to post some of the hands that killed me today. I'll split them up though, so hand numero 1 about to come right now. All comments welcome, I think my judgement is pretty off the hook right now:

Villain here is running 72/13/0.48 but has been really lucky so far...
I run 16/10.

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 8 Players
LeggoPoker Hand History Converter

MP2: $8.70
CO: $47.40
BTN: $48.75
SB: $51.95
Hero (BB): $49.25
UTG: $85
UTG+1: $55.20
MP1: $23.40

Pre-Flop: 4[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/heart.gif[/img] dealt to Hero (BB)
UTG calls $0.50, 6 folds, Hero checks

Flop: ($1.25) K[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $1</font>, <font color="red">UTG raises to $2</font>, Hero calls $1

Turn: ($5.25) 6[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">UTG bets $5.25</font>, <font color="red">Hero raises to $15</font>, UTG calls $9.75

River: ($35.25) 6[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">UTG bets $35.25</font>, Hero ?