[Tsuna knows what it's like to fear losing people. He's been alone before, and the fear of losing the friends he has now - if they no longer want to be around him or if they... die - here and at home is always a constant thing in the back of his mind. If Agito has that same fear, especially when it comes to losing Akito, he can relate to some extent]
A-Ah, I'm sorry, maybe I shouldn't have said something like that when I don't really know anything. [He looks apologetic and stares down idly at the ground, wishing he'd kept his mouth shut now that Akito seems more upset. A shake of the head] Don't apologize. I'm here for you to talk to, about anything.
And if you think he'll be bothered then- then you shouldn't say anymore to me. But, maybe, I don't know, maybe talking to him about this may help..? In any case, I think you should find him.