小小的心里全是你大大的世界唯爱你
[xiăo xiăo de xīn lĭ quán shì nĭ dà dà de shì jiè wéi ài nĭ]
'Small heart full of you, big world only loves you' indicates that despite the vast universe, all the user cares about is the object of their affection. The phrase emphasizes devotion and deep emotional commitment, suggesting they see only what matters most in their life — their loved one.