Mood: The mood of the video appears to be melancholic and nostalgic, with a theme of heartbreak and longing. The torn Polaroid photos and the title 'Don't Say Goodbye' suggest a sense of separation and yearning.

Environment: The environment appears to be a dark and intimate setting, possibly a nighttime cityscape or a indoor location with city lights visible in the background. The focus is on the torn Polaroid photos, suggesting a personal and emotional atmosphere.