I went through similar with an old school friend of my Son's. They were best mates forever. Roger lost his Mum and Dad and his older brother kicked him out of the family home. His drug use got into the really heavy stuff and he got sent to prison. He had nowhere to go when he came out. He stayed with us for a few months. I was so happy, he seemed to be happy and "clean". My son started noticing his stuff going missing and some of ours too. The police came and took him away. I was heartbroken, so I can only imagine how I would have felt in your place Mally :0(