I'm worried about my best friend. Please Read.

My best friend got into a relationship with her boyfriend about 6 months ago. In the beginning things seemed great. She was so happy. He treated her well, spoiled her and put her on a pedestal. They moved in together 2 months after being together and the red flags started flying. He started to become possessive and jealous and over the course of just a few months he has managed to completely isolate her from her family, friends and her positive support system. At first he made it seem like he just wanted her time and to start a family. Now, he has found something wrong with every person in her life and uses it as a reason for her to not be able to talk to anyone. (For example: she and I have been friends for 5+ years, we've gone through a lot together and we have always been there for each other. She's my best friend. She's like family to me. Well, at first he told her I was the only one of her friends he trusted and liked. At this point, she has completely cut me out; because he doesn't like that I know people from her past. That is his lame excuse anyways)

Well, the got married a month ago and things have gotten even worse. She finally came to me and told me everything. She told me how terribly he treats her, how she feels stuck and she cried. She apologized for cutting me out and told me she needed my guidance and love. I felt her pain and it killed me to see her like this.

So, we start to talk about how she could leave and basically started making a plan. 

About four days after she confided in me, she texted me and said she should have never brought me into the middle of this and she loves him & wants to work on their marriage. I said, ok I understand; but can I still be there for her? She told me she cannot risk losing her marriage over me. 

By the way, I work with this woman every day. Which makes it that much harder. I have never been this close to domestic abuse. I want to handle things the best way that I can so that when shit hits the fan, she knows she can still reach out to me. But it is so frustrating and I just don't know what to do.

It is in my nature to want to help, fix and save people. But I know I need to tread lightly here. Does anyone have advice on how to handle a situation like this? Do I step in and say something? Do I sit back until something terrible happens? 

❤️️