crocodile tear

noun2

1. •
   A tear shed insincerely, in a false display of sorrow or some other emotion.
2. •
   [in the plural] A display of tears that is forced or false.

   • And in all her letters since, she had spoken of her aunt as a silly, vain, worldly woman, weeping crocodile tears, for an old husband whose death had released her from the tedium of his company. — 1864