The most important thing we bring into a relationship is a healthy self. Does he have that to offer you? Tell him when he does, and can show proof that he has made an effort to have a healthy self, and when you have done as Ev suggested, then sure, go ahead and give in another try.
But until that happens, WALK. Or maybe RUN. Not away from him, to your best self. Then slow down, enjoy being a healthy you. That is a trip in itself.