You gave the correct answer.
Not your problem. He doesn't need help with the 6th step from you.
Good for you!!!!!!!!!!!!!!!!!!
I have no clue as to what his sponsor was thinking, I would NEVER tell one of my sponsees to have their SO help them with ANY of their steps.
J M H O based on over 30 years of continuous recovery from alcohol and drugs and over 27 years of working on my own codependent issues.
Love and hugs,