There is never a good time. But bring it up anyways. He's in your life and recovering, so he should be aware that you are in need of healing as well. It is not fair (in my opinion) for him to tell you that he does not want to talk about his past drug use because of his cravings. Tell him how important it is for you to be able to communicate with him. Go to meetings if you can Kristen. They help tremendously.