感谢你背叛我不如条狗
[găn xiè nĭ bèi pàn wŏ bù rú tiáo gŏu]
The username means 'Thank you for betraying me so that I am worse off than a dog'. Here, the word betrayal (背叛) highlights how the individual felt utterly let down by the other party, comparing his/her pain to even less worth than an animal, indicating a feeling of having hit rock bottom and possibly conveying an emotional response towards the treacherous actions committed against him/her.