Please Say/Whisper the Words out Loud
Lesson 1 : Q. Are we allowed to speak lashon hora to Hashem/God - for ex. if you want to vent or mentally work out a problem with someone else.
A. Surprizingly, NO. If we need to work out a problem, we need to speak to a trustworthy objective, third party person who can actually help us work it out. When we speak to Hashem about these kind of problems, we are venting to God Lashon hora, and that has no function other than tattletaling. Even though it may make us feel better at the time, it is not okay to complain to Gd about others.
Lesson 2 : Q. If we know someone is about to do something really wrong, are we allowed to tell them lashon hora to prevent them from doing that. For ex. If you know a guy is about to date a woman who you know is married (and is not saying that important fact). A. Yes! You would be obligated to say something (Carefully, constructively, and if you know it for a fact).