Sorry to hear you are going through this.
One thought that occurs to me about the amount that he is taking is that he may or may not actually be being honest about the amount and times of his using. Although the exact amount probably isn't really what is important at this time.
You seem like you are at a point where you know what you are willing to accept in your life and you're willing to set healthy boundaries for you. I think that is a really positive thing.