The rose symbolizes love, so it is also known as Cupid's flower. It is a witness of love between lovers, just like Cupid witnesses the eternity of lovers. They were childhood sweethearts, and they had already imprinted each other in their hearts. He knew very well that he loved her, but she couldn't tell whether she loved him or whether she loved him like a sister to her brother, but they had never confessed their inner feelings...
The flower language of light green roses is: I only love you...