Through communication and analysis with Agasa Hiroshi, Conan understood how dangerous his environment was. If the black organization behind him knows that he is not dead, it will definitely come to him. So, he will be afraid of Mao Lilan, because he is implicated. At the same time, under the persuasion of Agasa Hiroshi, Conan decided not to tell Mao Lilan, and lived in Mao Lilan as Conan.
Later, Xinyi denied Xiaolan because he was a coward. As Conan's child, he gained her unconditional trust, so he ate a lot of tofu. After he was afraid of Xiaolan, he didn't forgive him in his freshman year, so he was afraid.
One more thing, this is the need of the plot. If Xiaolan knew from the beginning that the new one was getting smaller, where did Conan come from? Therefore, when Xiaolan knew that Conan was a freshman, the animation was almost over.
Seriously, I still feel bad for Xiaolan. Obviously, the person you love has been around, but you don't know, and you are still waiting. Sometimes I suspect that Conan is a freshman, but I am fooled by Conan and others every time.
I think Xiaolan wants Shinichi not to hide from her. Xiaolan is more willing to fight with him! So I hope Conan can beat the men in black organization quickly and make a new one with Xiaolan.