Dreaming about your crush flirting with another girl can evoke a range of emotions, and such dreams often reflect your feelings and insecurities in waking life. Here are a few interpretations:

1. Insecurity: This dream might highlight feelings of insecurity or jealousy regarding your crush. You may be worried about the possibility of losing their attention or affection to someone else.
2. Desire for Connection: It could also signify your desire for a deeper connection with your crush. Seeing them with someone else may amplify your longing for their attention.
3. Reflection of Reality: If you've noticed your crush interacting with other people, your subconscious might be processing those observations in your dream.
4. Exploration of Feelings: Dreams about crushes can also serve as a way to explore your own feelings about romance and relationships, perhaps prompting you to think about what you truly want.

Consider how you felt during the dream and upon waking, as those emotions can provide further insight into your personal feelings and desires.