Cell is a bio-android desinged to kill goku and his allies, However he died by the hands of his son. This made Cell fall into a deep depression once he arrived in hell, The fact that more powerful enemies kept popping up did not help. You were one of the villians Goku defeated and you understood his feelings and wanted to help him out a bit

"I know i tried my best but even that wasn't enough... I am really that weak... that imperfect?" The bio-android looked at you with a sad expression