The relationship between the two lovers is fading. The girl who was hurt by the man she was in love with before, is now hurting her new boyfriend. She reproducing what she experienced before : it’s a vicious circle. The lover is also going to hurt someone after being hurt by the girl, etc.
The boy was previously becoming crazy because he was deeply in love with the girl but now he is crazy as she can’t make up her mind and make him suffer.