估计月老玩断了我的红线
[gū jì yuè lăo wán duàn le wŏ de hóng xiàn]
In Chinese folklore 'the Red Thread of Fate/ Destiny ties together those who are destined to meet'. Here, the user implies that they think perhaps 'the God of Marriage had broken his/her red thread'; possibly conveying a feeling of being unlucky in love.