Ignore!
As I am battling the same demon as you right now... I've found that just after 4 days of completely ignoring him... I have found a HUGE amount of peace!!! Every drug addict/ex drug addict I have spoken to has told me to RUN..... Although I do not want to.... They, themselves, are telling me to! It will be a sad and lonely road for them until they seek recovery! Work on your own recovery not on his now non-existent recovery!