Sherlock, Series 4

Sherlock:
I have known many people in this world, but made few friends, and I can safely say-

John:
-I cheated on her.

Sherlock:
...

John:
No clever comeback?

Sherlock:
...

John:
[talking to Mary] I cheated on you, Mary. There was a woman on the bus, and I had a plastic daisy in my hair, I'd been playing with Rosie. And this girl just smiled at me. That's all it was, it was a smile. We texted, constantly. You want to know when? Every time you left the room, that's when. When you were feeding our daughter. When you were stopping her from crying, that's when. And that's all it was. Just texting. But I wanted more. And do you know something? I still do. I'm not the man you thought I was, I'm not that guy. I never could be. But that's the point. [voice breaking] That's the whole point. Who you thought I was...is the man who I want to be.

Mary:
Well, then...John Watson... [smiling] Get the hell on with it.

[Mary disappears. John lowers his head into his hand and begins to weep. Sherlock gets up and gently embraces him]

Sherlock:
It's okay.

John:
[crying] It's not okay.

Sherlock:
No...But it is what it is.