Maggie and Nathan in “It's Alright, Ma (I'm Only Bleeding)”

Maggie

You don't owe me an explanation, obviously, but you're a good guy and a great surgeon, and I just... Why?

Nathan

I didn't lie to Meredith.

Maggie

It's fine. Forget it.

Nathan

Look, everything I told her was true. There was a patient. There was a helicopter. I just left some parts out. The part where we fought... where I cheated... where I failed the best person I've ever met, the only woman I've ever loved. And those parts are for me and Megan. You're right. I don't owe anyone that. I made a mistake, a big one. And I've paid for it ever since.