In relationships, there are reasonable requests and then there are unacceptable demands, such as needing to know your passwords for email, social networking etc. Trust is a necessary factor in any healthy relationship. Demands for any of your personal information without just cause can be related to her own inability to trust or her struggle with anxiety or insecurities. This is an infringement on your privacy and your individual human rights. Anyone who cares for you and your overall well-being would not make such demands.