It's natural to be angry, I so dislike what addiction does to our loved ones.
Just don't let the resentments eat you alive, it's good to feel them and release them to the universe and then find peace within ourselves through forgiveness and compassion. Sounds hard but I promise it's the only way to fight back against the pain and healing.
Sending hugs and prayers for you, it is hard to dispel the darkness sometimes.
Hugs