Addiction affects family and friends. When a loved one is struggling with active addiction, it can be difficult to separate feelings of fear and/or frustration and behave in a way that promotes healthy boundaries and wellbeing; while also supporting the addicted person. For that reason, there are also fellowships for family and friends of addicts/alcoholics.
Here are a few:
Learn2Cope (non-12step support for families of addicts/alcoholics)
Adult Children of Alcoholics
Al-Anon/Alateen (family members/friends of an alcoholic)
Co-Anon (for family members of cocaine addicts)
Nar-Anon (for families of addicts)
Gam-Anon (families affected by gambling addicts)