DEAR HARRIETTE: I am a 25-yearold living in an expensive city in the United States. I've always been frugal, but lately, this mindset has led me down a troubling path. I've found myself giving in to the temptation to steal items from stores rather than purchase them. At first, it seemed like a harmless way to save a few dollars, but now I can't shake the guilt that accompanies me when I look at ea…