It doesn't sound like he understands the first thing about healthy polyamory if the very idea of a family meeting on such an important topic is enough to upset him. As others have said, it's all about communication communication communication! I think I'd be anxious too if I were partnered with someone who didn't have that basic respect for me, for important decisions, or for clear and open, honest communication. I feel for you. Maybe he should read this thread.
The major players. Me, 30ish bi female. Gia, girlfriend of 4+ years. Clay, boyfriend/dom. Davis, ex/friend/"it's complicated." Eddie, roommate & fwb.
The supporting cast. Eric, Gia's husband. Bee, Gia and Eric's toddler. Dexter, Gia's lover. Helen, Eric's lover. Izzy and Nikki, Clay's partners. Liam, Eddie's husband.