Meaning of "She Knows When You're On My Mind" by George Strait

The lyrics of "She Knows When You're On My Mind" tell a poignant story of unrequited love and longing. The woman in the song is aware that the man she is with is emotionally unavailable, still attached to someone else who has hurt him. She tries to open the door to his heart, symbolized as the "door to heaven," but he cannot let her in because he is consumed by thoughts of the person who rejected him. The singer's internal struggle is evident as he is torn between two people - the one who loves him and is there for him, and the one who occupies his mind. This emotional conflict leads to a sense of guilt and sadness for both the singer and the woman who loves him, as they both know that his heart belongs to someone else.