if she doesnt bleed on the first night...and tells that it broke accidently...she belong to a respectable family and there can be no chance of having her involed sexually...there can be accidents and medical conditions sometimes...is it still that an issue in pakistani society..
Belonging to a decent family is not a guarantee that no hanky panky happened.
This myth is not limited to Pakistan. In many cultures , countries, religions and tribes it is believed that if a girl did not bleed on first night then she is not a virgin.
Jahalat has not boundaries or bounds. Even very educated people can hold this belief.