Big flop for 56o, how do you continue?

[AEKDBet]

A few hands in I double up through villain with AA v KK. He comments on what a big losing streak he is on. ~15 hands later he raises 35 in MP, I call with KQ and raise his 50 flop bet to 150 on a board of 3d 8d 9x, he pushes - said he had KK.

Preflop: Hero is UTG with 6[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $5.
<font color="red">Hero raises to $30</font>, 3 folds, BB calls $20.

Flop: ($65) 6[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/diamond.gif[/img] [color=#0000FF](2 players)</font>
BB checks,<font color="red"> Hero bets $50</font>,<font color="red"> BB raises to $125</font>

He most likely hand range is something like 88-JJ