What does it mean when you dream about an ex wife and killing a black scorpion?

On the surface, this dream seems to express feelings of needing to bring closure to a painful relationship. There may be unfinished business that continues to cause pain related to an old connection. Note that the "ex wife" need not represent that actual person, but could be a symbol for any difficult relationship in the past.

You desire the past and are dreaming about defeating the enemy.