一顆心只給一個人一份情只愛一個人
[yī kē xīn zhĭ gĕi yī gè rén yī fèn qíng zhĭ ài yī gè rén]
'One heart for only one person, one affection solely loving one person'. This suggests unwavering dedication to a single person - giving all your affection, loyalty, and love exclusively.