((((hugs)))) I'm really sorry to hear this news Blossom, but you have to realize his diagnosis has nothing to do with you or your actions or any decisions you have made.
You cannot protect him from the natural consequences of HIS own actions, right? It really, really blows that anyone would let their addiction destroy their health, but we all see addicts do it every single day in a thousand little ways despite all the warnings & signs they receive telling them to stop.