Dreaming about being intimate with both your boyfriend and his best friend can reflect various emotions and conflicts you're experiencing in your waking life. This dream may symbolize feelings of guilt, desire, or confusion regarding your current situation. It could indicate an inner struggle with your fidelity or the dynamics of your relationships.

Here are some possible interpretations:

1. Exploration of Feelings: The dream could represent a subconscious exploration of your feelings towards both men, highlighting your emotional turmoil since the incident.
2. Desire for Connection: It may signify a longing for deeper connection or intimacy, either with your boyfriend or in a broader sense, indicating a need to address your own emotional needs.
3. Conflict and Guilt: Given the recent mistake, the dream might be a manifestation of your guilt or anxiety about the situation. It could be a way for your mind to process the conflicting emotions you are experiencing.
4. Fear of Consequences: This dream could also reflect your fears about the repercussions of the mistake and how it might affect your relationship with your boyfriend.

Consider reflecting on your feelings and what this dream might be urging you to confront in your life. Open communication with your boyfriend and addressing the situation honestly may help you find clarity and resolution.