Why does blanche lie?

Blanche DuBois, a character in Tennessee Williams' "A Streetcar Named Desire," lies as a coping mechanism to escape her painful past and maintain a sense of dignity. Her fabrications allow her to create a more glamorous identity and mask her insecurities and trauma, particularly surrounding her failed marriage and the loss of her family home. Ultimately, her lies reflect her deep vulnerability and inability to confront reality, leading to her tragic downfall.