No matter how hard you try, you cannot fix or solve other people’s problems. Many in toxic relationships, keep hoping against hope that things will change. But they won’t. Don’t waste your life, trying to fix someone else’s destiny. That’s not your job.
This said, if you have the strength and inclination, be there for them. Be there to listen, or give support when necessary. But don’t make the woman feel guilty about staying in an abusive situation even when she has repeatedly told you she wants to leave him.
Sometimes it gets tiring to listen to the same story again and again. But that’s the best you can do. And hope, sense prevails.