Who said "I have learned that relationships are transactions."?

This quote is attributed to Lannister.

I have learned that relationships are transactions. - Lannister

"I have learned that relationships are transactions."

Lannister Relationships

"A Lannister always pays his debts."

"I am the god of tits and wine."

"You are an awful man."

"I drink and I know things."

"The key to a happy marriage is communication."

"Marriage is about compromise and understanding."

"Life's greatest treasures are relationships."

"Trust is a luxury I can't afford."