The dream takes place in a school setting, symbolizing a place of learning and growth. The presence of a teacher suggests a need for guidance and direction in your waking life. Your bad mood may represent feelings of frustration or dissatisfaction with your current situation. Seeking solitude in the cafeteria may indicate a desire for introspection and self-reflection. The appearance of your ex, who you haven’t seen in over 10 years, may symbolize unresolved feelings or unfinished business with this person. The girl with him could represent qualities or traits that you feel you lack. Making accidental eye contact with your ex may suggest a fear of confronting these unresolved emotions. His look of shock and confusion could reflect your own inner turmoil and confusion about your feelings towards him. This dream may be urging you to confront and process these emotions in order to move forward and find closure.