我说我疼你这不是演技我说我爱你那不是儿戏
[wŏ shuō wŏ téng nĭ zhè bù shì yăn jì wŏ shuō wŏ ài nĭ nèi bù shì ér xì]
Meaning 'When I say I care for you, it’s not acting; when I say I love you, it’s not playing,' it reflects earnest declarations about sincere affection rather than superficial or exaggerated ones.