Flopped flush line check ($50NL)

[kingnat]

If this is as dumbshit obvious as my other two I apologize.. i need to think more carefully about my hands. And I think the best way to do that would be to post them here. Sorry if they are the suck.

Villian was 15/7/1, is my line completely weak?...

PokerStars No-Limit Hold'em, $0.50 BB (9 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero ($53.75)
BB ($14.50)
UTG ($50.35)
UTG+1 ($50)
MP1 ($53.75)
MP2 ($57.90)
MP3 ($21.65)
CO ($11.25)
Button ($27.90)

Preflop: Hero is SB with 4, 5.
UTG calls $0.50, UTG+1 calls $0.50, 5 folds, Hero completes, BB checks.

Flop: ($2) A, 9, 6 (4 players)
Hero bets $1.75, BB folds, UTG folds, UTG+1 raises to $4.5, Hero calls $2.75.

Turn: ($11) J (2 players)
Hero checks, UTG+1 bets $7.5, Hero calls $7.50.

River: ($26) 8 (2 players)
Hero bets $11, UTG+1 calls $11.

Final Pot: $48

[XTR1000]

What do we put UTG on given his low AF?

Considering he´s not raising the Kh/AQ/AJ on flop we´re up against 99/66/flush. With a read he isn´t folding sets u could try to get it in asap but I dont hate the passive line u took.

[Dave K]

I would check raise the turn and try and get it in there, chalk it up as a cooler if he has the flush