The Legend of Korra, Season 1

Korra:
(concerning Lin Beifong) What is her deal? Even when she's on my side she's against me!

Tenzin:
I've known Lin since we were children. She's always been... challenging.

Korra:
What did your father do to make her hate the Avatar so much?

Tenzin:
My father and Lin got along famously. I'm afraid her issues are... with me.

Korra:
Wait a second! It all makes sense now. You and Beifong, Beifong and you, you two were a couple!

Tenzin:
WHAT?! How- Where'd you get that idea?

Korra:
Ha! Your wife.

Tenzin:
Crimeny! I'll have to have a word with her.

Korra:
So, Pema stole you from Beifong. I'm surprised our "esteemed Chief of Police" didn't throw her in jail.

Tenzin:
Oh, she tried. Anyway, Pema didn't steal me, Lin and I had been growing apart for some time. We both had... different goals in life- Why am I even telling you this?! It all happened a long time ago and we've moved past it.

Korra:
Mmm, apparently Beifong hasn't.

Tenzin:
What do you mea-- Of course she has. Anyway, this is none of your business.

Korra:
See you at home, Mr. Heartbreaker! [laughs]