Who said "Love is the weapon, and I know how to use it."?

This quote is attributed to Amy Dunne.

Love is the weapon, and I know how to use it. - Amy Dunne

"Love is the weapon, and I know how to use it."

Amy Dunne Love

Character in Gone Girl

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"I'm not a kind woman. I don't have that luxury."

"I'm thinking about how I can't possibly know what another person is thinking."

"Cool Girl is an unenviable position to be in."

"I have a meanness inside me, real as an organ."

"I love my wife, but sometimes she drives me crazy."

"Love conquers all obstacles."

"Love is patient, love is kind."

"I'm not stupid, I'm just in love!"