Hi Brandon,
That’s a difficult situation. I echo what Laura @LittleMissL said: Focus on yourself, live a good life as good as possible, be kind and careful to yourself and your children and leave the other relationships to God. A friendly manner and detachment are good tools to stay focused on the important things in life.
You can’t control your wife’s thoughts, feelings, behaviour, nor change it. What you can work on is being the best version of yourself.
We have a thread about problematic relationships with loved ones, it’s not limited to addiction related issues. Please feel free to read around and contribute. You are not alone 
Keep us posted, often sharing emotions and struggle helps to sort it and find a way to deal with it.
Here is the link to the mentioned thread (start). You can scroll to current posts and search for keywords if you like. Are you affected by a loved one who’s an addict?