[Of course he knew it. It was just different when people actually admitted needing him. What he didn't know was the fact that Jon thought he was actually a good friend. Yes, Jon had said similar things before, but it was usually under distress so the truth behind his words was always dubious.]

You-- [He frowns want to ask if Jon was sure about that, even after the whole nearly killing the boy when he first came here. Almost got him eaten by hounds, or planning out ways to kill him still in a possible incident he prayed would never come. He didn't know what it took to be a good friend, but he was pretty sure these weren't it. Still, Jon couldn't say these things unless he believes them to be true.]

...Sap. [He murmurs out around the cookie in his mouth. The next two cookies he picks up he pushes into Jon's stupid mouth to shut his stupid face. He just can't look at you right now. He'll just quietly sip his coco for a moment as he swallows his cookie.] I'm not a very good friend. Not sure why you still think that... but I will watch your back and continue to balance your shortcomings, so long as you'll balance mine.