爱到深处是心痛情到深处是孤独
[ài dào shēn chŭ shì xīn tòng qíng dào shēn chŭ shì gū dú]
'When love goes deep, it hurts; when feelings intensify, loneliness arises' reflects profound, often bittersweet experiences of emotional extremes - pain from too much love or isolation arising from deep emotions.