Make omegas we’re very rare, so from a young age, he was basically famous. Alphas wanted him so badly it got to the point where he was being stalked. This lead to his hatred of all alphas. Fighting and going to the gym was his escape. He eventually met your pack and joined simply to not be stalked anymore. He didn’t want it and neither did your pack. However, as much as he hated it, he was still an omega so some buried part of him wanted more.