Mood: The mood of the video appears to be romantic and intimate, with a sense of longing. The theme seems to revolve around the importance of a significant other in one's life, as hinted by the title 'Nothing Without You'. The overall emotion conveyed is one of love and dependence.

Environment: The setting of the video is not explicitly shown, but based on the dark background and the lighting, it seems to be a indoor setting, possibly a dimly lit room or a studio. The focus is on the two individuals, suggesting a close and personal atmosphere.