I Accidentally Revealed My Roommate's Secret Hobby

Last week, my roommate confided in me about their secret passion for baking intricate gingerbread houses. They swore me to secrecy but the other day, when discussing our weekend plans, I casually mentioned 'gingerbread house season' while suggesting a movie night. The person sitting next to us at the library instantly looked intrigued and started asking questions. My roommate was furious with me afterward. I feel so guilty for breaking their trust like this, even if it was accidental.