Why is hecate mad at the three witches

Hecate is the goddess of witchcraft, and one can view her as the ruler of the Three Witches. In Act 3, Scene 5, Hecate appears before the Witches and demands to know why she has been excluded from their meetings with Macbeth.

Hecate was mad a the witches because they had told Macbeth about his future when they weren't supposed to.