我姓唐而你从没为我变甜
[wŏ xìng táng ér nĭ cóng méi wéi wŏ biàn tián]
The owner implies his/her surname is Tang. This phrase expresses a bit of sarcasm: 'you were never sweet to me despite my presence'. 'Make someone sweet' usually refers to making them happy, pleased or feeling loved. Here, it means their relationship or interaction was lacking warmth.