Your dream seems to reflect your current feelings and the complex emotions surrounding your past crush on X. Here are some insights into the key elements of your dream:

1. Shopping and Nostalgia: The setting of shopping with friends in a place linked to your childhood suggests a desire to revisit happy memories and perhaps an exploration of your past feelings. It might indicate that you are processing your emotions related to X while also reflecting on your past.
2. Foamy Matcha Green Tea: This could symbolize a desire for something refreshing or new in your life, especially in the context of relationships. Matcha is often associated with calmness and balance, possibly indicating that you are seeking clarity in your feelings toward X.
3. Miscommunication about the "Date": X's misunderstanding of the situation highlights your own uncertainties. It could represent a fear of vulnerability or misinterpretation of intentions. This part of the dream suggests that you might be anxious about how X perceives you or how your feelings may be interpreted.
4. Separation from Friends: Getting separated from your friends in the dream may symbolize feelings of isolation or uncertainty as you navigate your feelings for X. This can reflect your apprehensions about rekindling feelings or the potential for a romantic relationship.

Overall, your dream seems to encapsulate a mix of nostalgia, current emotional confusion, and a desire for connection. It might be helpful to reflect on what you truly want regarding your feelings for X and how you can communicate those feelings moving forward. Trust your instincts and take your time in figuring out the best way to approach this situation.