I have no idea what GBs history or involvement in alcoholism is (quoting myself)
I have been dwelling while eating dinner and feel bad because I now realise how I recognise the narrative.
In that glorious stage where my brother has stopped drinking, gone through withdrawal and dried out we have a wonderful few days of him properly sober. He can be so insightful. He's a very intelligent man, very wise.
(until he has his first drink)
He doesn't want us to enable him. He reaffirms to us that when he is drinking, not to enable him. But he needs us to care. Not just that. He needs to know that we will always care. That we'll not give up on him.
If faced with the knowledge that lots of carers of alcoholics can and do get pushed too far, then he faces the hypothetical situation where he considers that we (his Mum and Sister) could stop caring. That we could reach the point where we can take no more and could leave his life completely - that is far, far, far too much for his vulnerable mind to cope with.
So as a means to cope, be blanks this thought. Too painful to consider, he has to always believe we will always be there for him. To consider the very real possibility that his alcoholism could result in us not being there for him would be so exceptionally painful that in the vulnerable moment of just sobering up, he is not (yet) strong enough to consider the possibility.
It is a very, very real possibility for all alcoholics though, in a way an alcoholic probably wont understand.
I don't blame my brother for blanking the hypothetical situation that we could stop caring. He needs to protect his own mental health and so there is no need to consider anything hypothetical.
It doesn't make it any less likely though, we cannot care for him if we are suicidal so their must be a limit in selfless care.