You don't know that, he knows her much better than you do, so if he said it it's because he knows she doesn't mind it, or because she didn't tell him not to do it so he didn't have to know. We don't even know if she wanted to keep it a secret, that's something you assumed, not something she has said.
Maybe she has not even made a decision yet and that's just a possibility.
I think what must be disheartening for her is how so many fans assume so many things about her without really knowing her.

If you actually read the interview you will see Daniel talks very fondly of Emma and he obviously is very proud of her, so I don't see how she wouldn't find that "disheartening".

Some of you really don't understand when he is joking lol he is having a laugh about one of the stories the tabloids made up early this year, that said something like that. That's why the article starts talking about some of the lies the tabloids have written about him.

Anyway, that was a fantastic interview, he is hilarious!

I can not believe of all things he said you chose the Brown thing to title this post!
I mean, he has pulished some poems! That's big, I wish we could find them, Emma said he is very good.

Btw, I love how he feels she and Rupert are like a sister and a brother to him. And also Tom is one of his best friends.

Then he is so straight, because he mentions straight people in all his interviews too. I mean, do you realize the absurdity of your comment?
He talks about what he is asked. And the fact that he makes no difference when talking about one or another speaks well of him, the fact that it makes a difference for you just tell us that you are an intolerant person.