I Ruined My Friend's Surprise Party

Last week, I was in on the plan to throw a surprise birthday party for my best friend, Sarah. We had everything set up, cake, balloons, and presents hidden around her house while she was at school. But as I was walking back home that day, I couldn’t resist peeking into her bag that we’d left by the door. Of course, it was full of clues about the party! When she got home, there were no surprises because everything was out in the open. I still feel terrible and don't know how to fix this.