200 NL flopped flush facing turn raise

[ghcnoob]

I'm relatively new to NL and have no clue what to do here. Villain is 27/20/1.2 over 50 hands or so. This was my last hand so I called p/f a bit loosely.

PokerStars No-Limit Hold'em, $2 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($102.30)
Hero ($339.65)
MP ($278.05)
CO ($65.50)
Button ($281.05)
SB ($201)

Preflop: Hero is UTG with 6[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/diamond.gif[/img].
Hero calls $2, <font color="#CC3333">MP raises to $8</font>, <font color="#666666">1 fold</font>, Button calls $8, <font color="#666666">2 folds</font>, Hero calls $6.

Flop: ($27) J[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $12</font>, MP calls $12, Button folds.

Turn: ($51) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $39</font>, <font color="#CC3333">MP raises to $78</font>

Hero??