Then it's possible someone who loved cats would never be happy with you. It's not about relative worth, it's about compatibility. Would you undergo allergy desensitization or take medication for life in order to be with her?
Actually,I think it is a case of relative worth in certain circumstances.If it was my sweetheart who had the allergy,I can't see *not* giving up my pet.And no,I wouldn't expect her to take pills or get shots because there's not a pill or shot in existence that doesn't carry at least *some* risk.
Human beings always have been,and always will be,far more important than a pet.