1. Frequent mention of ex: In our interactions, he sometimes unconsciously mentions his ex, including their past, shared experiences or habits, and even compares the similarities and differences between you and your ex in certain situations.
2. Keep the ex's belongings or contact information: He may keep gifts, photos, letters, and other items given by the ex, or not completely delete the ex's contact information and occasionally check or contact them.
3. Emotional fluctuations related to exes: When hearing or seeing information related to exes, their emotions may experience significant fluctuations, such as sudden silence, frustration, or anger, indicating that they have not fully let go of their inner selves.