It's not about what you actually want in this case, but what you could want. It's impossible to want people to betray your trust, because if you wanted it then

It's not about what you actually want in this case, but what you could want. It's impossible to want people to betray your trust, because if you wanted it then it wouldn't be betraying your trust. So that type of lying is strictly forbidden. You do not want to be deceived. But if include in "lies" such things as reading fiction aloud, then that can be permissible as you can want that: you aren't really deceived or betrayed.