Tough spot 3 handed - Can I fold here?

[zgall1]

What do I do here? This guy has been playing tight and even it seemed like he was contemplating folding 55 PF earlier in the 3-handed action when 3/4 of his stack was already in the pot. I am not sure if that is relevant.

I know a push will so rarely make him lay down a hand because of the ridiculous odds he is getting but I have no reason to believe he has hit a piece of this flop. So am I all in or do I just have to respect the fact that he was first in the pot and I have no real good play here other than to fold?

Party Poker No-Limit Hold'em Tourney, Big Blind is t150 (3 handed) FTR converter on zerodivide.cx

Button (t5155)
SB (t1625)
Hero (t1220)

Preflop: Hero is BB with 4[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/heart.gif[/img].
[color=#666666]1 fold</font>, SB completes, Hero checks.

Flop: (t300) 3[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img] [color=#0000FF](2 players)</font>
[color=#CC3333]SB bets t600</font>, Here ???