He is an active user who is not in recovery. His disease is a progressive disease that will continue to get worse unless he works a strong recovery program and stays clean for life and there is no cure, he will be an addict all his life. The possibility of him staying clean for life is less than 10%.
You are codependent, lieing for him is one sign, having no bounderies and allowing him back in your life time after time are a couple of others.
I would suggest that you read Codependent No More, locate Naranon meetings in your area and read all the stickeys at the top of this forum. Knowledge is power as you have become as sick as he is. His recovery is up to him and yours is up to you.
I am sorry that you are having to deal with this disease, however, there is a way out for you, it is up to you to make the right decision for you.
Keep posting, it will help.