毕竟深情不及久伴我愿深情久伴为你
[bì jìng shēn qíng bù jí jiŭ bàn wŏ yuàn shēn qíng jiŭ bàn wéi nĭ]
This translates to a more profound vow, essentially saying 'since lasting companionship trumps fleeting affection; I wish to have an eternal love just for you,' emphasizing the importance of enduring loyalty over transient emotionality.