爱到深处心已碎情到心里更憔悴
[ài dào shēn chŭ xīn yĭ suì qíng dào xīn lĭ gèng qiáo cuì]
Translation: 'When love runs deep the heart is broken; once emotions reach inside, they only cause more exhaustion.' This indicates profound pain and exhaustion derived from excessive emotion, such as infatuation or unrequited love.