I love Molly. She’s so ordinary; and yet she’s not a shallow character. I love this moment because Sherlock has just been outdone by little Molly Hooper, and he just stands there, speechless. I think this is when he finally realizes that she IS his friend. And he looks guilty for not seeing her before, for not admitting to himself that she DOES count.
(gif) "Molly: Are you okay? Don't just say you are, because I know what that means—looking sad when you think no one can see you. Sherlock: You can see me. Molly: I don't count..." Sherlocks face when Molly says "I don't count"...oh the feels :(