Most Helpful Girl
Leave her. This has gone from bad to worse. You don't need this type of stress. What if she tries to harm you, or kill you? She could be standing over you with a knife or gun. She had you arrested once, and her family is also threatening to have you arrested. Leave her and set yourself free. Plus, you don't want issues like this on your record. I understand her health is declining, but so is yours if you continue to deal with this woman. Stay away.
Most Helpful Guy
She is in a very bad place, when I had cancer I would attck my family, I was heavily drugged and didn't know what was going on, almost like a wounded animal.
It may be best for you to leave her alone, she has to get through this to get better, and maybe right now you arnt good for eachother. I would let her know you will be there for her through this treatment, but maybe you should put the relationship on hold. I know it hurts to think about that, but she needs help that you can't provide. I'm so sorry for both of you, this is some real life stuff to have to go through. Find someone you can talk to about this, sometimes venting to a real person who knows you can be very therapeutic. I wish you both the best in life, and I know in the end it will all work itself out. Life has a funny way of doing that.