Sherlock and Joan in “Unfinished Business”

Sherlock

Did you say everything you wanted to say today? To Moriarty? That is why you accompanied her to the Fuller residence, is it not? So you would have a private dialogue with her?

Joan

Well, you have been hogging her for the last few months.

Sherlock

I told you. I have merely been--

Joan

Studying her. Right. You have feelings for her, and that is perfectly normal.

Sherlock

I have nothing of the sort.

Joan

Irene was the love of your life. That is why, in spite of everything, you can't quite give her up. I get that. But I also know that you're only gonna get hurt in the long run because there is no Irene. There is only Moriarty. And Moriarty is never gonna change.