[She's sharp, he knows, and beyond that, she's openly caring. The last thing he wants is pity, so how can he word this properly to avoid it? There really is no hiding it. The best he can do is hold his head high and continue to appear perfect for her, like even this can't hold him back.]

I've been like this since I was born, you know? This weak body of mine can overwork itself so easily; at times even normal walking can exhaust me. In this case, Gladio-kun tried to take me for a run, and I collapsed.