It sounds like he is not asking to move back home. Are you feeling guilty about it all? That's what they do. They want you to feel guilty and are manipulative. We did let our son live with us knowing he used drugs (it would have been different if he had younger siblings but he is an only child so we let him live here while he was going through all that), but the reason we eventually kicked him out was he stole from us. It is so very hard and so stressful. We had to lock our bedroom door. It is very helpful to be on this board and also very helpful to read about enabling and detaching. My son lives with us now. He is a totally different person and off all drugs but those days were so hard and many of us know what you are going through. It has been a real answer to prayer.