Separate, rehome or butcher the nasty cockerel as his ongoing aggressive behaviour is not normal and should not be tolerated by the chicken keeper.
If he does not like her anymore, he could easily ignore her and just not mate with her.
Or add another adult rooster to your flock which will teach him manners and protect the victim.
If he does not like her anymore, he could easily ignore her and just not mate with her.
Or add another adult rooster to your flock which will teach him manners and protect the victim.