I went through this with a family member. It was crack. Lies and excuses, lies and excuses. Total selfishness. I empathize with you and hope he makes better choices.
Making sure someone does not kill themself is not a responsibility someone should take on alone. If you fear for his safety please call 911, or report it to the police.
Won't you look down upon me Jesus?
You've got to help me make a stand.
You've just got to see me through another day.
My body's aching and my time is at hand,
I won't make it any other way.
- James Taylor