Why did Parvati curse Bhairav?

Why did Parvati curse Bhairav? Parvati wanted to meet Shiva in the kingdom of Banasur but Bhairav didn't allow. She tried to explain him but he refused to listen in the name of security. Parvati got furious and cursed him that if he is such a good guard then he deserves to be a human for guarding them on earth for centuries.