Fwiw, I would consider it perfectly reasonable to ask him not to start an additional relationship at the present time, even if you WERE getting all your needs met, simply to give his new secondary relationship a chance to settle into a groove so you guys can really see how it's going to affect your lives, how much energy and time he'll ultimately want to put into it, etc. But especially considering that you're feeling a need for more from him, it's totally reasonable and probably wise for him to hold off and cultivate what he has.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.