My ex used to take all kinds of things from peoples houses - rings, knick knacks, pictures, silverware, plates, food, clothes, etc etc. And he would lie about it - even if he was caught red handed. It was part of the psychosis of his addiction. I don't think he knew why he did it. He was just compelled to steal and lie. People who are high don't think like normal people. They do all kinds of weird crazy things that make no sense. They are on drugs.