I think he does but doesn't realize it as his parents have made the very idea of an alpha having a relationship with a beta to be repulsive. It is like how some people who are SA'd as a child or even as adults find the idea of s*x to be repulsive. His mom even now isn't doing anything but worsen the situation when she was just as much to blame if not solely to blame at the beginning. But she never showed remorse for cheating on her husband when it was her choice to cheat. She never took accountability and kept enforcing the idea of an alpha being with a beta to be wrong. Kind of like homophobic parents who make their gay children internalize homophobia. Like they say don't fu*k up your kids.
Also did the top even like him before all that omega bullshit? I usually don't mind beta to omega or alpha to one trope but this situation is too shitty for that. It's like the top will only start to like romantically js bc he became an omega.. It's like an alpha is lusting after an omega rather than a man finally accepting his feelings for the one