She heard me...but I wasn't there

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This happened several years ago. I lived in an apartment at that time. My neighbor and I were friends and we both lived on the top floor. There weren't other apartments on the top floor. The walls between our apartments were very thin, and if someone was talking in the other apartment we were able to hear it. One day I came back from school, and when I was about to unlock my door my neighbor opened her door. She looked shocked and she said: ”But...but I thought you were already home. I heard you. You were walking around in your apartment and you were talking, I thought you were talking on the phone” I told her that it was impossible, I had just arrived from school, but she kept on saying that she heard me in my apartment. I got nervous when she said that. I thought that someone had broken into my apartment when I wasn't there, and she heard the person's footsteps, but it didn't make sense. She was sure that she had heard my voice, and the door was still locked. There was no balcony and it would be dangerous to climb through a window. I didn't really believe that anyone would do that. I unlocked the door and opened it while my friend and I stayed outside. We didn't hear anything at all, and we went inside. No one was there and nothing had been touched inside. I was relieved, but we never found out what my friend heard that day. She was sure that the sounds came from my apartment, and not from our downstairs neighbors. Actually we never heard the downstairs neighbors at all, and there were no upstairs neighbors since we lived on the top floor.