It's... [ Not about him. That's what it is. He can wallow in grief in private but around Nathan he needs to find a way to repair what the unplanned departure destroyed. He has to. ]
Listen... I'm sorry about the way things turned out. If I had a choice, I never would've left. You do realize that... don't you?
[ Tone somewhat fragile, but not out of personal grief just now. More worry. ]