I am just going to throw it out there. So if her bf is emotionally abusive then he's a jerk and that's that. Perhaps, her going back to her boyfriend could just be because she's stuck in an emotionally abusive relationship and she finds it difficult to leave despite the support you will give her as she is terrified of what he may do if she simply just left. I feel like these situations are tricky because she doesn't know what to do and may act out like blocking you from her story or posting throwbacks of her ex. If she has to remove you from her story then she is clearly contemplating her actions and is scared of your judgement. I feel like what you should do is despite what your thoughts are, you need to be there for her as a support network and be ready to help her if she leaves this toxic relationship. By not talking to her, you are, in a sense, isolating her for when she does reach out for help. You don't have to be okay with the relationship and if he is an emotional abuser then you should absolutely not be supporting it. But you should be supporting her, listening to her and just being a friend to her. If you establish a good, stable and supportive relationship for her maybe she won't be as scared to leave the relationship. But you are in every right to have your own feelings heard. If you feel as though you need to take a step back then please do. This is not on you if she has made her decision and you feel as though it is healthier for you to take some time out of this friendship. You need to do what's best for you.