Last night, I dreamed that I killed a little girl and bled all over the floor. How to interpret my dream?

Both the little girl and the little boy imply the yearning, hope and longing in your heart. The moral of this dream is that you suppress your inner yearning, hope and desire very much (it has been crushed to death) to meet and satisfy the requirements and expectations of everyone around you. I suggest you meet your inner yearning appropriately in reality. Maybe I will dream of playing games with them next time:)