How did Yi Yao die in a sad river?

Yi Yao received a strange message, saying that if she is Jiming's girlfriend, please come to the school warehouse and talk to her. Yi Yao thought that Qi Ming's girlfriend should be Gu Senxiang, so she forwarded the news to her. As a result, Gu Senxiang committed suicide. In the novel, Gu Senxiang wrote in a short message to Qi Ming before his death. I hate this dirty world. You can guess what happened that made her kill herself. Later, Gu Senxi found the short message forwarded by Yi Yao in her sister's mobile phone, thinking that she killed her sister. No matter how Yi Yao explained it, he wouldn't listen and said something very hurtful. Yi Yao later went to Ji Ming to clarify the matter. Therefore, Gu Senxi first told Ji Ming about it. Ji Ming didn't trust Yi Yao and told her to turn herself in. Said he didn't want to see her. Yi Yao said, ok, I'll show you me now. Then she committed suicide by jumping off a building. But the end of the novel doesn't say how Qi Ming died. So he wrote a few lines in the notebook, then turned off the light, unplugged the telephone line, went to the kitchen, and then went back to his room, lying in bed, and slowly closed his eyes in the dark. I can think of. I think I killed myself by turning on the gas.

I hope you are satisfied.