Maybe someone wants to do that if he/she doesn't have someone that close to him/her.
It is hard to find a true friend who doesn't care about anything, just want to make a good friend. We can share the secret with him/her, but we need to make sure that he can keep that secret from the other people.
How do you intent to know if he/she can keep the secret, by telling people telling him/her their secret? Don't you know that some lives are bulid on their secret once the secret is revealed their lifes end as well.
That is why we need to choose the right person, and maybe we can share the secret with someone that close to us, so he/she can keep the secret. We cannot pick random people to tell our secret because that is too dangerous for us, and we don't want to see something terrible will happen to us.
He/she will be our best friend in the sad and happy moment, and he/she will always be on our side whenever we needed him/her.
The best friend anyone can have in sad moment is God.
Yes, I agree. We can share to GOD about our feeling, and HE will keep our secret and help us to solve every problem we have.