Dream of Ex-girlfriend at Train Station: Meaning Meaning & Interpretation

"I had a strange dream about my ex-girlfriend. I was visiting another city for work. After a long meeting, I went to the train station to return to my hotel. My train was delayed, so I sat on a bench and looked at the people around me. A woman sat a few seats away. Something about her seemed familiar. I noticed her looking at me several times, but she quickly looked away whenever our eyes met. I started wondering if I had seen her somewhere before. After a few minutes, she stood up and walked past me. I recognized her voice when she spoke to someone on the phone. My heart suddenly started beating faster. I looked at her again, but she had her back toward me. She turned around, and our eyes met. We both froze. It was my ex-girlfriend. Neither of us knew what to say. We finally sat together and talked about our lives. We remembered old times and laughed, but there was also an uncomfortable silence between us. When my train arrived, she looked at me and smiled sadly. I wanted to say something, but the doors closed before I could. I watched the train leave and woke up wondering why meeting her still affected me so much."