This guy saw me stack off way too light twice against other tags and generally play like shit and kind of maniacal

it's like I can't put the ace in his range, but is he going to bluff 2x pot against me after I've shown a willingness to felt? These spots make me hate NL because I'd call a pot size bet SCRATCH THAT IT'S BECAUSE I'M BAD

Full Tilt No-Limit Hold'em, $0.50 BB (9 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

MP1 ($107.10)
Hero (MP2) ($50)
MP3 ($157.85)
Button ($50)
SB ($166.45)
BB ($114.85)
UTG ($72.85)
UTG+1 ($102.05)

Preflop: Hero is MP2 with K, K
3 folds, Hero raises to $1.75, 1 fold, Button calls $1.75, 2 folds

Flop: ($4.25) 6, 10, K (2 players)
Hero bets $4, Button calls $4

Turn: ($12.25) 8 (2 players)
Hero checks, Button bets $4.50, Hero calls $4.50

River: ($21.25) J (2 players)
Hero checks, Button bets $39.75 (All-In), Hero folds

Total pot: $21.25 | Rake: $1.05