Complex sentence: The song then goes in depth with the girl feeling abandoned and wondering if her boyfriend knows that she is there, she also states that if he stares closely at her eyes that she feels that he would not even care to look.
Split into simpler sentences: The song then goes in depth, with the girl feeling abandoned and wondering if her boyfriend knows that she is there. She also states, that if he stares closely at her eyes, that she feels that he would not even care to look.