You should have asked them what they thought was so bad with your play. The only thing I wouldn't do was to make a pot sized semibluff on the flop. But as he is still sticking with it and pushes (of course you have to call those last 115) I would get the feeling I am beat here. Only thing I can see is you played this really aggressive with huge bets. If you bet out like 300 instead (which will put him all in or fold just like your 500 bet) you can still get away from the hand to a push but it would be a tough fold for sure.