NAMI, the National Alliance for the Mentally Ill, is a great resource, I know in my area they host both in person and via zoom support groups for individuals supporting those with mental health issues. I would use that website to search your state for the available groups and find one that suits your needs and people with whom you gel, you might have to try a couple to find the right fit. I believe the site also has a list of resources outside of NAMI. There is also the DBA (depression and bipolar association) that has more specific groups focusing on these two diagnoses. Best wishes, it is a super complex situation especially when one refuses treatment. It might be helpful to learn your state's polices and procedures regarding involuntary commitments if your loved one is ever a danger to themselves or others (expressing thoughts of suicide and/or homicide) and need to be hospitalized for their own safety and the safety of others. Most states have a Board of Mental Health that is responsible for reviewing commitment requests and either accepting them or denying them. I hope this is helpful and wish I could be of more help, but each state's laws are different with different thresholds to define dangerousness to self or others. Best of luck, don't forget to take care of yourself first so that you can best take care of your loved one (like on a plane, you put your own oxygen on first before helping others).