This dream may represent your feelings towards your crush and your desire for a deeper connection with them. The fact that you were walking together and then she wanted to walk with someone else may symbolize your fear of losing her to someone else. The random person she knew could represent a potential rival for her attention. When she saw your disappointment, she reassured you by saying she is a big fish in the pond, implying that she is confident and desirable. This may reflect your admiration for her and your belief that she is out of your league. The kiss at the end could symbolize your desire to take a chance and express your feelings for her. It could also represent a merging of your emotions and a deeper understanding of each other. Overall, this dream may be a reflection of your longing for a romantic relationship with your crush and your fear of rejection.