[That is fine, because he isn't too sure what to say in that direction either. Since this is apparently Honesty Hour, though, and he knows that he's in no state to even begin to try and hide more things from you:]

I had to go because it's hard to stay here. It's hard to think, you know. Hard to breathe.

[Looking away, to watch his own fingers as they're drawing idle circles on the sheets.]

Tohru -- [Cutting off for a moment there, swallowing.] My father's on that bed. And, if things had been different, that could have been Aria. But now it's him.