Has he sort any help? Would he really be on his own or is there a way of you disengaging while someone else was still in his life?
The sad fact is that if you go down, so to speak you’ll be no good to him anyway!
It’s tough love and it works but you have to be able to cope with it as well as it’s not just tough love for the addict it’s the way for all those around him too.
My friend was in your position and she ended up taking her son away for 2 weeks in a caravan where he had no access to any drugs, just the occasional drink to help his through the withdrawals it doesn’t work for anyone and isn’t possible for a lot but sometimes extreme behaviours get extreme results?