Why did pyramus blame himself for thisbe 's death?

Pyramus blamed himself for Thisbe's death because he mistakenly believed she had been killed by a lion, leading him to think he had failed to protect her. Distraught and overwhelmed by guilt, he felt responsible for not being there to save her, which drove him to take his own life. His tragic misunderstanding of the situation ultimately highlights the theme of miscommunication and the devastating consequences it can have on love.