Over/NFD in 3-bet pot that BB cold-called...wtf?

[loosbastard]

CO is like 38/21 over a smallish sample and is stealing 55% of the time. I've 3-bet him like twice before and he practically insta-folded each time. I meant to make it 13.5 pre...but I don't play Absolute much and [censored] it up. Not a big deal though. Cold-caller is completely unknown. He just sat down a few hands ago.

Absolute Poker No-Limit Hold'em, $1 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

Button ($140.89)
<font color="#C00000">Hero ($198.60)</font>
<font color="#C00000">BB ($69.80)</font>
UTG ($163.85)
MP ($215.35)
CO ($114.72)

Preflop: Hero is SB with A[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">CO raises to $4</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $12.5</font>, BB calls $11.50, CO calls $8.50.

Flop: ($37.50) 7[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero?