NL 50 flopped set facing lots of heat

[kindergartencop]

co is a total monkey hes like 50/6. button is a solid tag. other than that nothing crazy has happened since ive been at table.

Poker Stars, $0.25/$0.50 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

UTG: $44.50
CO: $50.20
BTN: $225.15
Hero (SB): $55.70
BB: $50

Pre-Flop: 4[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/spade.gif[/img] dealt to Hero (SB)
UTG folds, CO calls $0.50, <font color="red">BTN raises to $2</font>, Hero calls $1.75, BB folds, CO calls $1.50

Flop: ($6.50) 4[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/spade.gif[/img] (3 Players)
<font color="red">Hero bets $5</font>, <font color="red">CO raises to $48.20 and is All-In</font>, <font color="red">BTN raises to $91.40</font>, Hero ?