Your dream reflects a powerful journey of self-empowerment and unresolved feelings from your past. Standing up for yourself suggests a desire for confidence and assertiveness in your waking life. The supportive cheers from others may symbolize a longing for validation and recognition for your true self.

Meeting "M" and feeling a mutual attraction, despite the lack of prior communication, could signify a yearning for deeper connections or the exploration of unexpressed feelings. This aspect of the dream might indicate that you're processing emotions related to potential relationships or missed opportunities in your past.

The appearance of your ex-boyfriend could represent unresolved feelings or lingering attachments from that relationship. Sitting together may highlight a need for closure or understanding regarding your past experiences.

Overall, this dream seems to encourage you to confront past relationships and emotions that may still influence your current life. It might be beneficial to reflect on your feelings about "M" and consider how they relate to your personal growth and the type of connections you want to cultivate moving forward. Engaging in self-discovery and open communication with those you feel drawn to can lead to fulfilling relationships in the future.