If he didn't want a relationship, he wasn't your bf or your secondary partner. He was just someone you hooked up with. There is nothing wrong with that, but I think it might be helpful to put things in their proper perspective. Don't take it so much to heart. If you actually form a serious, emotional relationship with another person, then you can fret about how much attention they're able to give you. In the meantime, give your friend the space he wants, tell him to call you if he wants to hook back up, and then leave him be. Then set about finding someone -- or someones -- to give you what you need. No harm no foul, and you guys had fun while it lasted, yeah?
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.