Small Mistake in My New Apartment

Moved into a new apartment recently, love it but still getting used to it all. One night had the curtains open and took off my clothes for a minute, don't know why I left them open like that. Next day found out someone walking by probably saw me. Told everyone I didn't notice anyone looking though... small lie really but felt guilty after. Not a big deal, just thought it was funny how careless I was.