This dream seems to reflect a mix of personal relationships, nostalgia, and the exploration of romantic feelings. Here are some insights into various elements of your dream:

1. Family Event: Being at a family gathering could symbolize a desire for connection, support, and a sense of belonging. It might also indicate an exploration of your roots and how they influence your current relationships.
2. Ex Best Friend: Your ex best friend represents a significant emotional connection. The act of her sleeping on your lap and you playing with her hair suggests a sense of comfort and intimacy, which may indicate unresolved feelings or a longing for that closeness again.
3. The Kiss: The kiss in your dream signifies a yearning for connection and possibly a desire to rekindle a relationship. Your blushing indicates a sense of vulnerability and excitement associated with romantic feelings. This part of the dream suggests you are contemplating deeper emotions and a potential romantic development.
4. The Girl from High School: Her reaction to the kiss might represent external judgment or societal expectations regarding relationships. It could also reflect your own insecurities about how others perceive your romantic interests.
5. The Arrest: The scene with the girl getting arrested could symbolize a release of negative feelings or past grievances. Your friend's reaction suggests a sense of justice or relief, perhaps indicating that you are moving away from past drama or conflicts.
6. Sitting on the Bench: This imagery of contemplation under a full moon in New York City likely symbolizes reflection and the pursuit of your desires. The full moon often represents clarity and emotional insight, suggesting that you are coming to terms with your feelings and considering the next steps in your relationships.

Overall, this dream points to a blend of longing for past connections, the excitement of potential new relationships, and the need to reflect on emotional ties. It may be encouraging you to explore your feelings toward your ex best friend and consider whether you want to pursue a deeper relationship. Trust your instincts and take your time in making decisions about your romantic life.