Dreaming about being in a relationship with your crush's best friend may reflect your feelings of attraction, desire, or perhaps some underlying emotions regarding your crush. Here are a few interpretations to consider:

1. Exploring Feelings: This dream could signify your subconscious exploring feelings of attraction beyond your initial crush. It may suggest that you are open to new possibilities or relationships.
2. Friendship Dynamics: Since the dream involves your crush's best friend, it could relate to your feelings about friendships and connections. It may indicate a desire for a deeper bond or a blend of friendship and romance.
3. Desire for Approval: Your crush's best friend could symbolize your desire for approval or validation. You might be seeking acceptance from your crush's social circle.
4. Conflict of Emotions: If you have feelings for both individuals, the dream could represent a conflict or confusion about your emotions, revealing your inner thoughts about loyalty, attraction, and desire.
5. Wish Fulfillment: Lastly, the dream might simply be a reflection of your wishes or fantasies regarding relationships and connection, indicating a longing for companionship.

Consider how you felt during the dream and any emotions or thoughts it stirred upon waking. Reflecting on these feelings can provide further insight into your current relationship desires and emotional state.