What is the meaning of the lyrics of the song "Love Song" sung by Zhao Yang?

The lyrics of Zhao Yang's song "Love Song of Infatuation" express one person's love for another person, but this person doesn't get a response. The lyrics "Only you know my heart, who can care about me after you leave" express the hero's persistence and firmness in love, while "I expect you to give me a bright future, but you let me wander alone in the dark" expresses the hero's disappointment and helplessness in love.