Flush on turn; fold to 3-bet?

[A_K]

Had a couple flush draws tonight that I'm not sure I played correctly, playing the draws too passively in multiway pots and perhaps hanging on to made flushes too much as well. This hand may be an example of both. Fire away.

Shorthanded table, not six-max. Villian is slightly LAGish, and I saw some fairly agressive post-flop play (very agressive with middle pair and an overcard for example). Starts are 29/5/2.8 over seventy hands. UTG is a oose-passive fish.

PokerStars 0.25/0.50 Hold'em (6 handed) converter

Preflop: Hero is SB with 9[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, CO <font color="#CC3333">Villan</font> calls, Button calls, Hero completes, BB checks.

Flop: (5 SB) K[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Hero bets</font>, BB folds, UTG calls, <font color="#CC3333">Villan raises</font>, <font color="#CC3333">Button 3-bets</font>, Hero calls, UTG calls, Villan calls.

Cap the flop here with the flush draw but not the nut flush draw?

Turn: (8.50 BB) 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, UTG checks, <font color="#CC3333">Villan bets</font>, Button calls, <font color="#CC3333">Hero raises</font>, UTG calls, <font color="#CC3333">Villan 3-bets</font>, Button calls, Hero . . .

The three-bet here in the face of my check-raise is scary. Fold to the three-bet? Call down?

[Edited to fix nits]