Dreams about friends transforming into romantic partners can symbolize a variety of things. Here are some possible interpretations:

1. Exploration of Emotions: The dream might reflect your feelings towards your friend or your friendship itself. It could signify a desire to explore deeper emotional connections or recognize attributes in your friend that you admire.
2. Change in Dynamics: The transformation from friend to girlfriend may indicate a shift in your relationship dynamics. It could suggest that you are considering more profound aspects of your friendship or that you are reevaluating how you connect with each other.
3. Integration of Traits: Sometimes, dreaming of a friend as a romantic partner can symbolize the integration of their qualities into your own life. You might be subconsciously acknowledging traits you find appealing or wish to embody.
4. Exploring Identity: Such dreams can also be a way of exploring your own identity and feelings about relationships. It may not necessarily reflect sexual orientation but rather a curiosity about various forms of connection.
5. Comfort and Safety: Sleeping next to a friend can symbolize comfort and safety. The dream might represent a need for support and companionship in your waking life.

Consider how you felt during the dream and any current situations in your life that might relate to these themes. Reflecting on these aspects can help you gain deeper insights into the meaning of your dream.