I was Mal from Descendants but I was a mermaid version of her. I had to spend a decade in the water before I could return to land. When I came back, my ex-boyfriend and my best friend were standing on the beach I returned to. I ran up and hugged my best friend but my best friend became my ex. I didn't think anything of it and started walking down the beach with him and we were talking as if we never broke up. I don't remember anything of what we said until I said, "I can't do this anymore. I have to find and marry Prince Ben (from Descendants)." and then the dream ended.
This dream may symbolize a desire for change and growth in your waking life. Being transformed into a mermaid version of Mal could represent a period of transformation and self-discovery that you are currently going through. The decade spent in the water before returning to land could symbolize a period of emotional and spiritual growth that you feel you need in order to move forward in your life.
The presence of your ex-boyfriend and best friend in the dream could represent different aspects of yourself or different relationships in your life. The transformation of your best friend into your ex could suggest unresolved feelings or conflicts that you have with this person.
The decision to pursue Prince Ben could represent a desire for stability, leadership, or a sense of direction in your life. This dream may be urging you to focus on your own goals and aspirations, rather than being distracted by past relationships or attachments that no longer serve you.
Overall, this dream may be encouraging you to embrace change, take control of your own destiny, and focus on finding fulfillment and happiness in your own life.