Lu Yiyi's performance today was somewhat unexpected to him, and he wanted to pay more attention to her.
"What has gotten into you?" Normally she wouldn't act like this; if she saw him disheveled with someone else, at most she would ignore it and walk into the room.
"Nothing, it's just that I cleaned the room yesterday and I don't want you to mess it up. And please, next time you want to bring a woman home, do it elsewhere. If you can't afford a hotel, I can pay for you. But don't bring just any woman home. I don't want to have to be on guard in my own home, fearing to contract some unwanted diseases!"
Lu Yiyi is a doctor, and as such, she has a certain obsession with cleanliness - a severe one. Be it mentally, practically, or otherwise, she is very particular about hygiene.
For her, toothbrushes and men are things she would never share with others.
If her man touched another woman, no matter how much she liked him, she would not want him anymore.