Dreams involving ex-partners can often evoke strong emotions and may reflect unresolved feelings or concerns about past relationships. In your dream, seeing your ex with your best friend and sister could symbolize feelings of betrayal, insecurity, or fear of losing important relationships in your life.

This dream may also highlight your subconscious processing of trust issues or feelings of competition. It might be worth considering how you feel about your current relationships with your best friend and sister. Are there any underlying tensions or unresolved issues that need addressing?

To gain deeper insights, reflect on your feelings during the dream and upon waking. Were you angry, sad, or indifferent? This emotional response can provide clues about what your subconscious is trying to communicate.

Ultimately, this dream may serve as a reminder to assess your current relationships and ensure open communication to avoid misunderstandings or hurt feelings.