[I dunno]

I don't think a turn check is clearly wrong, but I think you should be leading it a lot more often than trying to c/r.

I also feel more comfortable that I'm making the correct decision by bet-folding in the situation you describe than I do check-folding.

As played, if it goes check, pot, repot, it would be a tough fold. I dont like stacking off in an unraised pot, but in this sitaution I think no preflop raise makes it less likely the nut flush is out there. I'd probably call. A bet by UTG could be a lot of things.