Family members are affected by substance use and other addictions. There is a tremendous amount both in the news and in public discourse about what family/friends can do for people affected by addictions. Sometimes it's cast as simply attending Al Anon for example.  There are many professionals who are trained in Community Reinforcement and Family Training (CRAFT) who may be able to help you help yourself and the addict in compassionate and productive ways.

Note: The Community Reinforcement and Family Training (CRAFT Model) was developed by Drs. Robert J. Meyers and Jane Ellen Smith at the University of New Mexico. 

If you need a counsellor or psychologist to help you, as a friend or a family member, with addiction of another you may find someone here.

Many individuals have relationships which differ from societal expectations for relationships.  Ethical Non-Monogamy works for some individuals.  It can include polyamory in its different forms or Open relationships.

When experimenting with alternate relationships it's important to expand communication skills to create and maintain healthy non-traditional relationships.  Issues with jealousy, shame, authenticity may come up and can be explored with a skilled, non-judgmental therapist.