i agree with cynical, i'm a ra and i can tell you from experience, its not about you. being an addict is like being in prison, locked away and having no control over addiction. its a miserable life to live and there is nothing you can do but take care of you.
like tchappy says, do whatever you have to do to keep your mind occupied. do whatever you can lose your thoughts about him in doing. minute by minute, it will get easier.