忍心看我一人饱受思念之苦
[rĕn xīn kàn wŏ yī rén băo shòu sī niàn zhī kŭ]
Roughly translate into: 'Be strong enough to see me suffering all alone missing you'. This internet handle shows that the person is enduring the distress of separation, and is hoping that others would empathize their loneliness. There is a little bit pleading in this sentence as well.