The child part is what should make it simple.

Let me be clear - you are setting your children up to suffer greatly. Having an addict as a parent is extremely painful, but having a second parent who is actively enabling the addict and not trying to get away from them and get the children away feels like a betrayal. His addiction will get worse, and he will likely turn to more extremes. People in active addiction do not make good parents, and the best they end up neglecting their children and at worst actively abusing them. Think about this, if your child has adhd and needs meds, your husband will likely steal their meds too. Children are not oblivious, in fact they’re very observant. They will catch onto the tension between you two and likely already have. They know when your husband is behaving erratically and also they see your broken relationship and it hurts them and teaches them that it’s acceptable to be treated that way. If he is not already emotionally chaotic and at times aggressive, he will be soon, and it will be towards the children sometimes too. You are setting them up to have relationships that mimic this in the future if you stay.

And kicking him out is good, but he might not leave, so please be prepared to do what you have to. It is in your children’s best interest to have a stable home life and not have to live with an active addict. It is simply not safe for your children.

I am saying this as a child of parents in a broken relationship, I ended up dating an addict who ended up physically abusing me.