Molly forced Fred to spy on Ginny's 'suspicious' new friend..and accidentally set them up. You kept it a secret from her, but everyone else knew.

One day in winter break, you were at the burrow with Harry and Hermione, and of course the others. You were in Ginny's room with the door open, you didnt notice Fred leaning on the doorway, until he knocked on the doorway to announce his presence.