I am so very sorry for what brings you back here, but am glad that you have SR to come to for support. You are not alone!
The thing is, he has been given so many opportunities. With an addict, if you rob them of the consequences of their actions, they have no incentive to do anything but to keep using. For some, many in fact, it is not until they face some hard jail time that they actually get it. Some don't ever get it.
I would continue to do what you are doing, which is to step back from this. You did not cause it, you cannot control it, and you cannot cure it. The best thing you can do is pray for him.
Hugs to you. Keep posting, we are here for you!