@jessiefletch Welcome to this thread which is a sanity-restoring life line for so many of us.
I have an alcoholic Dad, and also an alcoholic ex partner (my first relationship post break down of my marriage, thankfully therefore not also the Dad of my children.)
Just to echo that self care and self protection are not selfish but also absolutely vital.
My ex, like your Mum, like everyone’s loved ones of this thread had ALL the reasons for drinking, an endless supply: living alone after the breakdown of his marriage, not living with his children anymore, the decline and eventual stop of contact with his children after he relapsed very quickly after each rehab attempt, poor health, poor mental health, arguments with his siblings, arguments with his Dad, arguments with his friends, and of course me and all my perceived failings and wrong doings. So many times I have fallen into the trap of believing him and feeling sorry for him, and of course when we were together running around trying to fix crises and cover everything up so that he wouldn’t have a trigger to drink.
But ultimately, they have to learn to cope with life stresses and strains without abusing a substance which makes everything worse. We cannot do that for them and we have to step away to protect our own lives and sanity until they are ready to do so. And many sadly are never ready to put in the hard work daily to do so.
While ex and I were still together, the stress and strains and covering up made me less of a mum, less of a friend, less of a colleague because I was so exhausted and worried all the time. You are brave and justified setting your boundaries so that a loved one’s alcoholic addiction doesn’t ruin your life as well as theirs