Give him time. But, if you guys re-enage as partners, make it under the condition that he get way, way better at communicating things to you as they're happening, not once they're too big to do anything about.
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.