I found out the hard way that, actually, i can't help anybody properly if i don't help myself first.
Different situation, but same with the abuse. I knew it was them who needed help but i was 'trapped' in the bog with them - and all they were doing is pulling further down and nothing was changing for the better.
It was a choice of Groundhog Day for the rest of my life or do something,anything to get myself back on 'dry land' first.
It meant leaving. The only way i could save my sanity and future.
But it was so liberating!
Yes, it felt selfish at first. I couldn't afford to spend anymore emotional and mental energy trying to 'rescue/help/manage' them.
Moving out, being financially independent of them gave me the peace of mind,power and confidence i need to deal with it.
I can still support them, have a relationship with them - but there are boundaries.
If they don't do anything to help themselves, or just want to go round in circles complaining and doing my head in - i can go home and i don't have to deal with it.
I don't have dc, but i grew up in an abusive household. It was awful. You see and hear everything - even though the adults think they're protecting you.
I heard all the arguments, felt the awful daily atmosphere. As a child i felt it was my fault, as though if i had not been born they wouldn't be facing those problems.
I wish my parents had separated, i hated seeing my mother having to literally beg for money to feed/clothe us, having to account for every penny, having to take the insults and accept being treated like shit just so she could provide for us.
You could still help and support him whilst living separately? Temporary on the basis that he gets help and you start seeing positive changes?