When to leak the news?

I wish i can blurt everything out without the need to care or bother what other people say. But this time i choose to be selfish ignorance conservative. No one will ever understand my feelings.
Not sure when is the right time to leak the news out.
Its either gonna be a big BIG BIG surprise or its gonna be a bad news

Looking at you, you were so happy. When i was about to open my mouth to leak the news, my conscience told me to stop and shut up. Because i do not want to spoil your happy mood and i want you to be happy.

So i thought it would be good to tell when you are sad. But the news will make you even sadder and i do not want you to be sad.

Thus, can someone tell me, when should i leak the big news? This news is gonna hurt all the people who are very close to me.

Maybe i took the wrong route made the wrong decision. I have caused so much trouble.