Yeah, the BF doesn't sound supportive and could be disruptive to the group therapy process for you and others in the group. If you are able, an option might be to go to a couple's session with a psychologist/therapist, who can help answer some of the BFs questions about Bipolar Disorder, discuss ways to be supportive, what is not supportive, and resources if he wants to exploring concerns about himself. Depending on where you live, there may be a support group available for spouses/significant others/family members of those with bipolar/depression or another bipolar/depression group where BF could go separate from you.