Because you chose her...
Look how you care about John Watson.
I don't have friends... I've just got one.
Because Sherlock Holmes is a great man, and I think one day—if we’re very very lucky—he might even be a good one.
Well, you're hardly going to need me around now that you've got a real baby on the way.
Do you just carry on talking when I'm away?
Well, we can't all three dance. There are limits!
You look sad when you think he can't see you.
Like I said, human error.
(Monsters and Critics interview, October 2010 [x])