Dream ex girlfriend returned but was extremely mean
Dreams involving an ex-partner indicate unfinished business or unresolved feelings from the past. The fact that your ex-girlfriend returned in the dream suggests that you may still have feelings or unresolved issues regarding her.
The fact that she was extremely mean in the dream suggests that you might have negative emotions or unresolved conflicts related to the break-up. You may be still holding onto resentment or anger towards your ex-girlfriend, and this could be manifesting in your dreams.
It may be helpful to reflect on your emotions and thoughts surrounding your past relationship and try to identify any unresolved issues. It might also be useful to seek the help of a therapist or a trusted friend to process and address these emotions.