Who said "I learned that loyalty has limits when it's one-sided."?

This quote is attributed to Peggy Olson.

I learned that loyalty has limits when it's one-sided. - Peggy Olson

"I learned that loyalty has limits when it's one-sided."

Peggy Olson Friendship

"I'm not just a secretary. I'm a copywriter."

"You're thinking about this all wrong. It's not about what you want—it's about what they need."

"I didn't come this far to be somebody's girl."

"Every time we get a chance to do something, it matters."

"Friendship is built on trust and honesty."

"True friendship is worth more than gold."

"Good friends are like stars, always there even when you can't see them."

"Friendship means sacrifice."