1. Deep friendship: Becoming best friends between a girl and a boy means that they have established a deep friendship that goes beyond ordinary friendship. This friendship is not dependent on gender, but based on mutual understanding, respect, and support.
2. Intimacy without gender boundaries: Girlfriend relationships usually involve a high degree of trust and intimacy. As girlfriends, girls and boys can share each other's secrets, joys and sorrows, and even show a high degree of tacit understanding and care in daily life. This intimacy is not limited by gender boundaries.
3. Complementarity and mutual growth: In a best friend relationship, girls and boys may have different perspectives and experiences due to gender differences, which allows them to complement each other and learn new things from each other. At the same time, they will also grow together with each other's support and encouragement, facing the challenges of life.