I'd fold to the raise.

You raised preflop and led on the flop to show strength, which he is now raising into. Either he's stupid, or he's got something like AK, KQ, KJ, slow played AA, maybe a small set. There are a wide range of hands with reasonable probability that beat you here, and it's a long road to showdown with only two outs.

Assume he's not stupid and fold, but watch for evidence that he is stupid.

Just my $0.02.