Yushu was only saying this out of pure emotion-Mengyao was gone, and Lin Yi knew her secret, so she'd shed her stupid facade at times like this.
When she was alone with Lin Yi at home, she didn't make any noise, just read a book or watch TV in the living room. She didn't do anything stupid because she didn't need to do it in front of Lin Yi, and she didn't need to hide her loneliness and confusion in front of him.
Mengyao was gone, and she might have to go too. She didn't know what her future life would be like.
She didn't know if she'd have a chance to live after the Sky Class Island Plan, or if she'd have a chance to get back together with Lin Yi, Mengyao, Xiaoxiao, and Tang Yun ... She didn't have any confidence at all, and even the Prophet wouldn't be able to keep her promise ...