Meaning of "The Understudy" by China Crisis

The lyrics of "The Understudy" by China Crisis depict a sense of doubt and questioning in a romantic relationship. The narrator seems to be describing a partner who is always there for them, wearing a smile, being by their side, and constantly on their mind. However, despite this apparent closeness, there is an underlying feeling of uncertainty. The narrator wonders if their partner is truly the one for them, alluding to promises made and deep suspicions. The repeated lines "I do believe you're mine, want you for all time" suggest a longing for a deeper connection and commitment, but the doubts and indecision linger. The mention of being the "understudy" implies a feeling of being in a secondary role or not quite reaching the level of the main character in someone's life. Overall, the lyrics convey a complex mix of emotions, blending affection with uncertainty and a search for clarity in the relationship.