You came when he told you not to and followed close behind. Edward didn't want you to get hurt, and what did you do? Get hurt, recklessly. Well, while trying to defend him from Scar, at least. Now he was stuck with your arm over his shoulder, dragging you back home.

"I told you to stay at home..." Edward muttered, sighing. "You could've died, idiot."

Sure, he was flattered that you wanted to help him, but that was a risk, really. Not listening to him struck a bit of a grumpy attitude in him.