Ren Lei was an ass in doing that, when there is life there is hope, after his death the servant girl will probably just die or be desperate enough to commit suicide like him.
I agree with you but you cant really try to rationalise the way a person who is wallowing in that much self-pity and self-hate would think. He felt he had no hope and thus, he took drastic actions; actions he perhaps should not have taken.
Seems like she truly loved him but never actually 'courted' him per say so they we're really just friends. Sucks the blind girl gave up her love, or maybe she was threatened? đ¤