爱情若情深似海我定不负你
[ài qíng ruò qíng shēn sì hăi wŏ dìng bù fù nĭ]
Expresses a vow or a commitment: if the love is as deep as an ocean then I will never let you down or abandon you. It shows a very sincere, unwavering dedication in love, emphasizing fidelity and responsibility in relationship.