Strong emotion flows through this piece. The way you ended it was incredible. I would only recommend one small change in this piece. When you said "There is no more fight" perhaps change this to "There is no more fighting."
This is resolute, but also very sad! It so aptly reflects the grim resolution and sadness of those affected innocently by the abusive habits of another! Sadly, denial is such a strong force for the addict that he cannot reason and or see the harm he is doing others!
You have done such an excellent job with this! It is not all sugary, blubbery, or cliché, but it so aptly reflects an adult numbness and sadness at a senseless loss!