User blog comment:FairyRaven/Fairy Tail Chapter 365: Fairy in the Jail!, Review and Commentary/@comment-76.121.234.236-20131230020022/@comment-7418318-20131231093822

The only situations in which I could imagine Natsu realizing that would be:
 * 1) He wakes up in a cell chained and beaten to a bloody pulp
 * 2) After freeing her, Erza smacks some sense into him
 * 3) Some alien (or magical) virus invades his head and implants some common sense

I kinda hope that Lucy and Wendy will manage to follow him and one or both of them end up hurt, forcing them to retreat without Erza and Mira. And then Natsu realizes it was all his fault for charging in alone and without thinking and feels incredibly guilty about it. That might finally wisen him up for good.