Quote from Ted in The Autumn of Break-Ups
Marshall: I'm so sorry, buddy. Lily: But, bright side... Robin is gonna be so touched when she hears you ended things with Victoria because of her. Ted: She can never know. Promise me Robin will never find out. Lily: I don't understand. Ted: Promise. Both: Promise. Future Ted: [v.o.] Of course, Robin did find out. But we'll get to that.