Hilchos Rechilus, chapter 9, section 8 9

Know also that in all the laws we wrote, it makes no difference whether his friend asks and pushes him to tell, or he tells him on his own. If all the details are met, he must tell him even if the friend does not ask and look into it. And if the details are not met, it is forbidden to tell, even if the friend asks and pushes him to tell.

Know also that he must be careful about all the details above even if he only wants to tell the story to other people, since this is also included in rechilus.