5/10 betting paired board into the PFR

[Poldi]

Button is 21/6/2, raised A-high HU on the flop and called it down vs a reraise.
SB is 51/9/1.2


Party Poker 5/10 Hold'em (6 max, 4 handed) converter

Preflop: Hero is BB with A[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Button raises</font>, SB calls, Hero calls.

Flop: (6 SB) 6[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, SB calls, Hero folds..

Fold preflop because its not HU? Flop bet +EV?