Nut flush on the turn getting reraised, what's the best play?

[insyder19]

I really don't know if a flat call is good here or if he's bluffing and I want him to bluff on the river as well or if he really has a hand, what's the best play here?

Titan No-Limit Hold'em, $0.25/$0.50BB (Titan HH Converter by Kreatief)

CO ($60.15) (Hero)
Button ($46.40)
SB ($3.60)
BB ($50.00)
MP2 ($136.10)
MP3 ($33.05)

Preflop: Hero is CO with A[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/heart.gif[/img]
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to 2.0</font>, <font color="#666666">2 folds</font>, BB calls $1.50,

Flop: 3[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/heart.gif[/img] ( $4.25 )
BB checks, <font color="#CC3333">Hero bets $3.00</font>, BB calls $3.00,

Turn: 2[img]/images/graemlins/heart.gif[/img] ( $10.25 )
BB checks, <font color="#CC3333">Hero bets $6.00</font>, <font color="#CC3333">BB raises to 16.0</font>, Hero calls $10.00,

River: 5[img]/images/graemlins/club.gif[/img] ( $42.25 )
<font color="#CC3333">BB bets $29.00</font>, Hero calls $29.00,

Final Pot: $97.25