I'm not really focusing on LOA much anymore, but I do believe in the principles.
So in this case the way it might help is focusing on his good points and not focusing on the relapse . . . for me, I must process my anger and disappointment first. I still love him (the true essence of him, not the acting out addict) - so there is love underneath the anger.
For me right now, it is just honoring my feelings in the moment.
I have been keeping busy - I feel some sadness but it's not debilitating.