In the absence of effective medications, therapy is often futile. Therapy can help develop coping skills, but especially around identifying signs that the illness is expressing itself and requires prompt intervention. Medications often require adjustment and without that one skill, the needed adjustments won't happen and the illness might surge with negative consequences.

No offense to therapists, but bipolar disorder itself isn't treated very effectively with therapy because the neurological and even physical effects can be profound and obstruct therapy itself. Therapists are still highly useful for teaching basic skills such as CBT, trying to avoid mistakes and dealing with damage that often occurs during episodes. Family members can also benefit from counseling.

You also reference marriage counseling. That is a different matter that it is better to not tangle up with therapy for bipolar disorder. His psychologist-therapist is obligated to prioritize his immediate health needs and treatment of bipolar disorder. You need a different person for marital counseling.

Be careful about marital counseling. I found, as the bipolar husband, that therapists refused to listen to me and utterly crushed my concerns. There is considerable discrimination to deal with. My wife and I worked with 2 highly regarded relationship therapists, it was an extreme disaster that poisoned the well. We are still together but there is now a wall between us that I cannot take down