[There's a pause as he thinks but at the end he decides to be direct. He has always worked better with being blunt after all.]

Your brother was sent back and it doesn't sound as if he has returned with you. Can anyone in this place comfort you about it enough so that you stop missing him?

I'm her boyfriend, you're one of her dear friends. The only comfort I can give her in that regards is that I won't leave her side, but that doesn't make the fact that you left any less painful or less real for any of us.