Abusive men are often at their most dangerous when they fear losing control – at the point of separation. Please do not tell him about any action you may be about to take or are thinking of taking.
A good place to start talking things through is with the National Domestic Violence helpline (0808 2000 247), which is run in partnership by Women’s Aid (womensaid.org.uk) and Refuge (refuge.org.uk). They can talk you through what protection is available to you, both practical and emotional, and there is plenty of information on the websites. The organisations may put you in touch with a local refuge or support group and may also give you practical advice about keeping vital documents safe and out of the home.