我也曾是你说过的全部
[wŏ yĕ céng shì nĭ shuō guò de quán bù]
Using this phrase as a nickname can represent a period when the person might have felt extremely important or all-encompassing to someone in their life, which now might evoke feelings of nostalgia or reflection on past relationships. In addition, this nickname conveys the depth and intensity of the bond they shared.