碧海蓝天闺蜜嫁了我的他
[bì hăi lán tiān guī mì jià le wŏ de tā]
'Blue sea and sky - My bestie married my crush'. It could be referring to a situation where the user's close friend ends up marrying the person they once fancied. In Chinese tradition, blue often conveys melancholy, thus giving rise to bittersweet sentiment here.