情深似海未深溺相濡以沫久成痴
[qíng shēn sì hăi wèi shēn nì xiāng rú yĭ mò jiŭ chéng chī]
Deep Affection Like the Sea Without Getting Drowned, Caring Mutually With Deep Emotions Leading Eventually to Obsession. It poetically describes very profound love or attachment similar to the ocean depth but staying in healthy boundaries, cherishing each other wholeheartedly until the deep bond gradually becomes infatuation.