We can't help who we love. Sometimes the people we love are sick. Sometimes we need to help them. In certain cases we do the most help by being there for them and in other cases we help the most by letting them go. I cannot tell you what to do in the situation other than to protect yourself and stay safe. No matter what you decide, I can tell it will be difficult for you and so my heart really goes out to you in this situation. It is hard to walk away from someone who is destroying themselves. It is hard to stand by them and watch them self destruct. You are in a difficult place and I'm sorry. I hope both you and your girlfriend find happiness and contentment in life.