Best friend is in an abusive marriage

[Mollie5]

My best friend is in an abusive marriage, her husband belittles her and is also violent. I've tried calling explaining to her that his behaviour is unacceptable and that she needs to leave him but she is confused about what to do. Please can I get some advice on what to do, I feel so anxious about this.

Tell her that you will always be available for her, day or night, 24/7 if she needs to talk, or decides to leave him, or whatever.
However, be careful not to tell her what a horrible arse he is anymore. She knows you think this, but needs to feel able to talk to you about him without you being judgemental about whatever choices she chooses to make. (Not saying you are being)
It's very easy, through wanting to help, to isolate the person in the abusive situation so that when the shit hits the fan they feel that they have no one to turn to.
Advice here for you both.
www.gov.uk/guidance/domestic-abuse-how-to-get-help