百依百顺敌不过他忽冷忽热
[băi yī băi shùn dí bù guò tā hū lĕng hū rè]
Suggests that no matter how much one complies with or caters to a person's needs, it cannot match or win over someone who treats the individual inconsistently—'even if one bends backwards, it can't compare to someone's fluctuating affections'. This conveys feelings of frustration towards unrequited love and unreliable behavior from another.