What does silence sound like after someone says 'I'm fine'?

I’ve been sitting with that phrase for weeks now — not the lie, not the mask, but the way it hangs in the air afterward. Like a door closing on a room full of things that never got said. I keep thinking about the guy who used to say it before he went quiet for good. Not even a goodbye. Just… fine. And then nothing. What do you hear when someone says that? Not words. Something heavier.