Group Therapy: Am I The Jerk for Wanting Chocolate?

Would a lie have worked BETTER in this situation?? Am I The Jerk for being honest with my girlfriend when she asked a question about the birthday cake she made me?

Source: https://www.reddit.com/r/AITAH/comments/1614m7e/aita_for_being_honest_with_my_girlfriend_when_she/