The context of the following conversation is Robin was concerned their Kai was smoking drugs so when Kai left for school Robin entered Kai's room to search for evidence.:
Kai says Robin was acting very paranoid when I left this morning..
The friend responds What did she say that seemed off?.
Kai responds She didn't say anything, but kept waiting around for me to leave like she wanted to do something secret..
The friend responds Maybe she thinks you're on drugs again and is going to search your stuff..
Kai responds That's a waste of time, I don't do drugs anymore..
The friend responds You should tell her that when you get home to put her mind at ease..