I think that if you have already separated, it is time for you to actually emotionally separate. There is nothing you can do or say. His recovery is his own, and only he can conduct it. If he is a grown up man, he can get all the information and support he wants if and when he wants it without any help.
I suggest doing your own growing and personal work - as a co-dependent, in therapy, finding a life of your own, things you enjoy, parenting, etc.
If he left 6 months ago and is out of contact, it is because he wants to be.
Alcoholic or non-alcoholic, when someone leaves and breaks off contact, they are done with the relationship. His telling you it is better for you is simply his being graceful and polite. Adults get to decide what relationships they want to engage in or let go of. Your only responsibility is yourself and your children.
Good luck with the letting go. I think this belongs in the friends and family forum, BTW.