RE: Outright Lies vs Lies of Omission: A Matter of Trust

I feel you in this post and the examples you gave are top-notch. Here is my thought, though.
I don't think sharing personal information about yourself with someone you don't trust is wise in the first place, especially when you carefully think about it and you know that person can use your truth against you.

Now, when talking to a person you trust, and there is information needed, the lie of omission is leaving out important details. Sometimes, we feel it helps protect someone we love, like the example you gave.

Telling your friend you went out with some other friends but left the information that her ex was around"

If that person trusts you and you trust her, I don't think giving that information should cause any harm to the friendship; she would just want to know more. But when she finds out that you went out and the ex was there, and you already gave her some information but left out one of the most important parts of the information, the trust level will reduce, and a lot of things would be going through her mind.

When a lie of omission starts in a friendship or relationship, such a ship is heading towards a huge iceberg and if not careful, it will sink.

I believe it's better not to tell if they don't ask than to say half the truth and mislead people we love and should trust, but if they are people we don't owe any explanation to, we shouldn't even bother answering.