i just want to point out that you said you are afraid to tell him to leave, as it's winter, where will he go, etc. but also said that his mother always rescues him. so he would go to her place, yes? of course him going to a real, inpatient rehab would be best, and then you would not have to worry for that time, maybe get a firm foundation again.
he's on suboxone yet he's detoxing? he must be detoxing from non-opiate substances?
it is a process. we don't always take one step forward, then another and another. sometimes we take a step or two back. it's just part of the process.
stay in touch, sweetie.