This guy called every 3bet. 2 previous I have lost. Once he hitted fd and betted river only with 1/3 pot - it's a kinda note that he bets his strong hand small.
Spoiler

How do you like my line? The flush is probably in his range, but due to note we have to discount it especially on paired board. So on the river he has a bunch of 9x, 7x, 4x missed.
Grabbed by Holdem Manager
NL Holdem $0.25(BB) Replayer
Hero ($35.45)
BB ($28.76)
UTG ($25.35)
UTG+1 ($25)
CO ($21.20)
BTN ($28.92)
Dealt to Hero Q♠ Q♥
fold, fold, fold, BTN raises to $0.50, Hero raises to $2, fold, BTN calls $1.50
FLOP ($4.25) 6♦ 8♥ 5♦
Hero bets $3, BTN calls $3
TURN ($10.25) 6♦ 8♥ 5♦ 8♦
Hero checks, BTN bets $6, Hero calls $6
RIVER ($22.25) 6♦ 8♥ 5♦ 8♦ J♣
Hero checks, BTN bets $12, Hero calls $12