User blog comment:IamJakuhoRaikoben/Chapter 474: In the Moment of Complete Silence, Review./@comment-73.173.42.152-20160224130450/@comment-4829046-20160224142348

I'm still putting this out as the only important factor - Gray didn't actually get involved in that to get affected. He just remembers pain and we all know that FT mages take emotional pain more seriously than physical. Plenty of people have tried to kill him and it makes little sense for him to behave weird around a mislead child that had already received life lessons from Juiva, who was also extremely mislead prior to meeting Gray.

I don't think Gajeel should be brought into this. That's just the way his character was written. To this day he hides what he really means unless it becomes too much(like Belno's death) and it is more of a thing where other characters understanding his hidden feelings and thus do not require him to word it out. This is displayed the most through Levy and Lily since the three hardly ever need to speak in order to convey the most basic messages(the Gajeel spin-off is great for this). Only difference is that Lily is similar to Gejeel and thus adapted to it faster than Levy who was still uneasy till the Tenrou Island attack. Bottom line though, Gajeel doesn't really need to apologize, it is just his character and everyone is okay with it. :D