Do I finally let go of this relationship?

We were together for 5 years and we stopped talking for a few months (but texted and emailed in between) after a fight about moving forward with our relationship as in kids and marriage. Then he contacted me after some months only to tell me that he dated around (I didn't date because fell it wasn't officially over between us), has become a non functioning alcoholic and depressed. I truly care for him and pushed him to get into detox, referred him to a few doctors including a social worker, dragged him to doctors appointments and helped him get his life in order. We started talking about having a family again and now he has completely shut me out by withdrawing, ignoring me while calling me manipulative and not appreciating all that I have done for him. I am at a loss.
Do I finally let go of this relationship?
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