[He'll never ever think you have to be sorry for anything, much less this. Much less when it feels like he's the one that should be saying that in light of this, stomach coiling, no distraction of a task at hand to really hold the implication of all this at bay. It's almost desperate, miserable, when he says:]
I should have found you. I could have-- I wasn't listening. [He didn't let himself, didn't open up to the Black Lion the way she should have. And meanwhile Shiro was all alone. The touch on his shoulder does ground him, a little but it's the combination of everything that's happened, of the rush of memories both from his lost feelings and just returning in general, to the fight to... everything. He doesn't shout but his voice is raw, emotional.] I should have found you.