It almost looks to me like he thought u had Ax flush draw - once he had boat he stopped worrying and shoved. Lets look at the most likley solid, 'bet large" possible
hands he could have here: 33, AA and dreaded KQs. UR gonna win most times so u have to play aa strong - BUT...follow ur instinct - as a fellow Micro player I know that you can come back from $6k ez and $18k by no means secures a final table. So if ur gut was telling you fold - sure y not.But I think u have to pay him off.