<human>: I have a friend that I've known for just over 4 years who I care for very deeply. She's always been the one person I truly feel comfortable around and we've always been able to talk about anything and everything. We laugh together, we cry together, we've seen each other at our bests and our worsts, and I genuinely can't imagine my life without her being a part of it.  For just over a month now, she's been dating an older guy that lives close to her, and from some of the things I've seen/heard from her and her friends, he treats her like shit. He drinks heavily, his mood changes rapidly and he has a tendency of becoming easily angered if something doesn't suit him. They tend to argue regularly because of this. From my perspective he seems emotionally unstable and I'm worried that it might lead to her getting hurt. About a week ago after another argument, I voiced my concerns to her and told her about how I feel. She told me that she feels the same way and wants to leave him, and that she feels like she's trapped, but at the same time, she still loves him.
 
I'm unsure about what I should do. I know I can do a better job than he can. I care about her a lot and I hate the idea of her being hurt or treated badly, but at the same time I feel like I'm getting involved in something that is seriously toxic or that could potentially lead to me being strung along while she tries to make up her mind.

Can you give me the gist of the text in a nutshell?
<bot>: Friend in an unhealthy relationship with an older guy, has mixed feelings about him and myself, unsure what I should do.