Noct was a little nervous as Prompto's entire demeanor changed. He wanted to wave it off, just to get Prompto to calm.down,but then Prompto dropped the bomb and Noct had to strain to hear but he heard it.

"You... Excuse me? I..." He felt a little... Betrayed? Prompto had never told him he liked Gladio! "I... Um... Well... Um..." Yeah, he didn't know what to say.