Hi Lawrie,
I am sorry you are going through this.
I would look to why you keep gravitating towards addicts. That is what I am doing for myself. As well as educating myself, posting here and attending meetings.
I am also doing healthy, positive things in my life, and travelling.
Somebody here posted a really good article before called 'Do You Love To Be Needed Or Need To Be Loved' which has some great insights.
Just don't be more invested in his recovery than he. Be invested in yours.
Be the invitation but don't expect that he will definitely take it.
Sending hugs.