I Must Be High by Wilco is a poignant song that delves into themes of regret, confusion, and self-reflection. The narrator seems to be grappling with a sense of loss and disillusionment, possibly in a romantic relationship. The chorus's repetition of 'I must be high' suggests a feeling of disbelief or surrealism about the current state of their life. Key moments include introspective lines that touch upon failed expectations and the struggle to understand where things went wrong. It encapsulates the emotional turmoil of realizing that one's perceptions may have been skewed, leading to a sense of betrayal or disappointment.