单恋的痛苦卑微等候的煎熬心碎
[dān liàn de tòng kŭ bēi wēi dĕng hòu de jiān áo xīn suì]
Pain from unrequited love accompanied by waiting anxiously until one feels shattered expresses the torment of loving someone unilaterally which leaves one feeling humble and heartbroken due to uncertainty.