false as Cressida

Unfaithful. A phrase used to underscore one's infidelity. In medieval tales of the Trojan War, Cressida is a Trojan woman who pledged herself to Troilus, only to forsake him for Diomedes later. I know you cheated on me! You're as false as Cressida! Mark is going be so hurt when he finds out you've been cheating on him. You should have just ended your relationship instead of being false as Cressida. Who are you to say that I'm false as Cressida? For your information, I have always been faithful to my husband!