[viggosen]

I think you played it wrong postflop, but not because you went broke with it, as I see it the problem is not what happens when you are bwhind, then you will always go broke.
The problem is what happens when you are in front, if he has an underpair he has 2 outs, if he has an ace he has 3 outs (i don´t belive he has called a bet for 500 preflop with anything with a 3, and there is no draws). So I think you must give Villain a chance to bluff at the pot, either check or bet ½ pot, unlike Robilaruk I doN´t think there is anything to think about with that flop, you want to get all his money in on the flop, and if he has the aces or a J, it is just tough luck.
(don`t get me wrong its because pot its about 40% of your remaining stack on the flop, if it had been under 20% then you might consider giving it up, but even then, I think you had to have a read on the player that he was unlikely to bluff)