Ed doesn't want to dwell on his breakdown. It was unpleasant, deeply unpleasant, and he doesn't want to have to explain the circumstances, what he saw and heard, or anything more. He nurses his secrets in ways unlike most Gothamites; he ignores them as much as possible.

He just nods when Oswald actually starts eating, relaxing into his seat a bit more and sipping his tea. He knows it's good, his cooking has actually improved here, with practice and a decent sized kitchen.

He's content to be quiet for now, mostly because Oswald needs to eat and this silence isn't actually heavy, uncomfortable and oppressive. Just a quiet as Oswald eats and Ed enjoys his drink.