IMO u made the right play.He doubled raise under the gun, so he probably has strong hand preflop. He is passive, when passive players check raise usually it"s a monster.He probably has jj,or aa, ak at worst.
you still have enough chips to fold after your flop bet.
So u bet he told u where u were at, u have t1500 with t100blinds.I think it"s ez fold,u can pick a better spot