Flopped Nut Flush, Board Pairs on Turn

[rhizome]

Opponent is 49/1.2/1.21
Ok to fold this on the river?

Party Poker 3.00/6.00 Hold'em <font color="#0000FF">(6 handed)</font> link

Preflop: Hero is UTG with K[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">Hero raises</font>, <font color="#666666">4 folds</font>, BB calls.

Flop: (4.33 SB) 9[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero checks.

Turn: (2.17 BB) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">BB 3-bets</font>, <font color="#CC3333">Hero caps</font>, BB calls.

River: (10.17 BB) A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, Hero folds.

Final Pot: 11.17 BB.

[imported_leader]

I would bet the flop. A check looks so suspicious to anyone who's paying attention (admittedly this guy might not be one of those people but I don't see what he's calling on the turn that he's folding on the flop). The only real question on the river is if he has another flush 1 in 11 times. Frankly I don't know so I'd probably call.

[Spicymoose]

Please bet the flop. Once you reach the river, I think a fold is in order.

[Roy6]

Not betting the flop here is very fishy (in all meaning).