Have a very close friend of many years. Our kids are very good friends. She is a wonderful person but she makes some very questionable choices. Especially with her choice in men.
Her current partner is a complete dickhead. He is controlling, abusive, lazy and awful to her. I think he is also involved in some criminal activity but not sure to what extent. She has a son from a previous relationship and two kids with current partner. He shows little interest in any of the kids. He doesn't provide financially for her but refuses to help around the house too. He's also incredibly rude to any of her friends and family (myself included) who dare to visit the house to see her. He makes it clear we are not welcome and the atmosphere is just terrible.
We've had so many chats over this. One minute she is leaving, the next they are perfectly happy again. I've been supportive but also clear on my feelings towards him. I don't feel like I want to go to the house anymore when he makes it so unpleasant.
She's recently done her usual trick of saying she's leaving then backtracking and now there are lots of loving social media posts and pictures of their recent trip to the seaside on with hashtag family times 
Aibu to just wash my hands of this? I'm done with supporting her and listening to the dramas only for her to go back again. I know it's her life and not my business. I also know it's not my place to interfere but I'm also sick of hearing about it and having to deal with him when I pop round to see her.