过去的过不去
[guò qù de guò bù qù]
This username implies that the past is so unforgettable and heavy that it's hard to get over. In Chinese culture, people may have suffered or gone through difficult times which have a deep impact on their life. They find the pain, joy or other emotions derived from past memories too intense to be easily released. This reflects a melancholic mood and perhaps an unwillingness to accept the present reality.