Bella cannot imagine not wanting to know something like that herself; it is a fairly important thing to know about someone, not to mention the time and energy that would be saved on grieving for a person who did not deserve it.

But she also knows very well that not everyone is her, and not everyone wants to know the things she would want to know. Not to mention that Sherlock knows, probably better than anyone, what Tony can handle and what he can't, and if Sherlock of all people is advocating keeping something like this secret . . .

Bella nods.

"I won't say a word to him," she promises.