KK Monotone Flop – Misplay Of The Day

Villain in this hand is  Rick Charger, who I have 24/5.8/0.89 over 200 hands

Poker Stars, $1/$2 NL Hold’em Cash Game, 9 Players
LeggoPoker Hand History Converter

MP1: $210.90
Hero (MP2): $214
CO: $208.15
BTN: $328.55
SB: $134.85
BB: $230.30
UTG: $79.75
UTG+1: $214.35
UTG+2: $209

Pre-Flop: K K dealt to Hero (MP2)
4 folds, Hero raises to $8, CO folds, BTN calls $8, 2 folds

Flop: ($19) J 5 9 (2 Players)
Hero bets $13, BTN calls $13

Error #1: I should have bet more here, $16 or so.

Turn: ($45) 4 (2 Players)
Hero bets $32, BTN calls $32

At this point in the hand I really have no reason to think that I don’t have the best hand do I? He seems like the sort of player that would raise with a set on such a flop. If he has just peeled one with the ace of spades, the four of diamonds is a nice card. What is your line here? I decided to bet, once again I should have bet more here…

River: ($109) 7 (2 Players)
Hero ???

I’m getting a bad feeling about this hand now, the only hand I really feel I’m good against is AJ with the A of spades, maybe QT with a spade. I’m pretty sure he has a flush though, probably the nut flush because it seems like a slowplay. I’m lost here, I feel like check/folding, but that seems so wrong. 

Results: $289 Pot ($3 Rake)

Hero mucked K K and LOST (-$143 NET)
BTN showed A T (a flush, Ace high) and WON $286 (+$143 NET)