Trapped Forever

You have no obligation to care for someone that failed to care for you. Stop taking care of him/her. Walk away.

You will be free when you decide to be free. Abuse kind of cancels your obligation to care for that person.

Firstly, I am extremely sorry for what has happened to you. While I am unaware of the full story, I imagine whatever you have gone through to be very traumatic indeed.
In response to your question (and at risk of severely undermining the complexity of your situation) I would do as the previous user advised - pack my things, and leave. If it means you leave with only the clothes on your back and the change in your pocket, you do so. The level of psychological trauma that can arise from having to look after your abuser would be much more severe if you didn't. Put yourself first. You are your priority. I pray with all my heart that you are given the help/opportunity you need to start afresh. Thank you for your question. God bless. xxx

just leave. pack up your bags and leave. the only way is up Hun.