Sorry to read that, its awful.
Sadly whilst in active addiction, it’s like having your mind and brain taken over completely. You don’t think about consequences or anyone else’s feelings, just where you will be getting the next fix or how to lie and manipulate people around you – it’s a truly disgusting illness on so many levels.
With family its so much harder as you want them back, and you want them to be well – lots of people I know pursue this into oblivion as they never truly understand what is happening.
Has he ever made any sounds about getting help at all?