Fold pre, fold flop, fold turn.
Preflop you haven;t given us the CO's 3bet% or his positional 3bet%s (alot of regs do not 3bet bluff from the CO). However even if he was 3betting wide, I am not willing to flat AJo OOP. His value range crushes us, will often take alot of money from us when we both hit, were out of position so even if he does have a bluffing
range here it will often just take the pot down unimproved.
The flop we have the CO behind us, his range still crushes us, even more so now we've whiffed the flop.
I feel I need to emphasize these are very costly mistakes and not me nitpicking like I usually do.