I met this girl a few years back, through her then boyfriend, now husband, that I've known for a couple decades.  Over the years we'd all talk and b.s. at our local bar. The only contact I have with her is randomly running into her after work at this same bar (we're what you call "bar friends").  But, we enjoy each other's company, minus the husband. I can get along with him, because I've known him for so long and we had similar interests, as well as working together. But, he can be an asshole.  I've known this since I met him. When I met her, I thought she knew he could be and asshole, as he displays it often.  So, recently, job stress for both of them have stressed their marriage, and he's turned into a bigger asshole.  She can't stand him most days. So, y'all can see where this is going. . .Ive told her that he isn't going to change and she knows what needs to happen. And, the longer she puts it off hoping that it'll get better, the worse it's going to be for her.  But, she says that she still loves him.  

I don't make friends very well due to my past and current depression.  But, when I find one, especially if I connect with them, I tend to give a shit about them. I genuinely care about my friends.  Always have.  I don't want to see her get hurt. But, I know that is an inevitable outcome for her (emotionally).  So far, their situation hasn't turned physical. But, he has history with ex's that have experienced it from him. I definitely don't want that to happen.  

I don't want to lose her as a friend. But, I will not watch while she stays and makes it worse for herself. 

I know their relationship isn't any of my business, and I should just stay out of it. But, I hate seeing her this way.  We're friends enough that she knows she can vent to me, and offer insights. I can't talk to her husband, because I don't think she's told him that she tells me what's going on. And I don't always trust him.