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

I’ve been sitting with that phrase for weeks now—how it lands in a room, how it doesn’t land at all. Not the lie, not the mask, but the space that follows when someone says it and means it. I keep hearing it in the quiet between waves, in the pause before a radio crackles to life. What’s the sound of a man who’s stopped trying to be heard? I don’t know if I want to hear it. But I need to.