[Ford stares. He...can't answer that. He feels okay, but he felt okay before, and then, when his project had failed, he'd fallen apart, worse than he'd thought he would.]

....I don't know. I thought I was fine, too.

[How do you define "okay" if it isn't "able to go on"?]

I'm happy with you, Bill. And I'm happy that Stan's here, too. But I'm not happy on this ship. I'm here because it's where I have to be. Are you happy here? Could you ever be?

[100% rhetorical.]