Jess, you absolutely need to walk away from this.
His addiciton seems to be out of control and there is nothing you can do to help him, if he doesnt want to help himself there is nothing you can do he honestly wont change, addiction is a disease and incurable most of the time.
You must put yourself first – he wont change. Alcohol and drug addiction completely changes the person you once fell in love with and its so hard to accept.
Life is way too short to be mentally drained by this, you deserve to live a happy life too and if his anger is out of control and hes being sexually aggressive you must walk.
I think youll end up going round in circles.
I wish you well my love – keep us posted x