He's waiting for an explanation.
When someone hurts the man he loves, he wants answers. It took him long enough to calm Simon down, and now that he's safe and calm enough to be sleeping in his bed, curled up under comforters and blankets galore, there's nothing left for Nuri to do but wait. He wants to know what sort of kid would make Simon want to leave and never look back. He wants to know...a lot of shit.
He's particularly interested in finding out what the fuck is so wrong with wanting to help.