Meaning of "I Must Be High" by Wilco

The lyrics of "I Must Be High" speak to the bittersweet realization that sometimes we only appreciate things or people once they are gone. The speaker's partner takes them for granted, never truly valuing the relationship until it's ending. The reference to being "high" could symbolize a state of detachment or altered perception that allows the speaker to let go of something that is no longer serving them, even if it causes them pain. Overall, the lyrics reflect on the complexities of human relationships, the irony of missed opportunities, and the struggle to say goodbye when it's necessary.