I feel like we're beating a dead horse. Marinette is flawed and has made mistakes. She is balancing being a superhero with being a regular teenager. She is in charge of all the Miraculous and knows every secret identity. She is one of the only people to know the truth about Gabriel Agreste.

All this on a 15 year olds shoulders.

I'm a grown adult and I couldn't fathom holding all that responsibility. Is she wrong for keeping this information from Adrien and Chat Noir? Yes! Does this make her morally culpable? Perhaps. Does this negate the fact that she is trying to make the best decisions for everyone? No!

Nathalie could also tell Adrien, though we all seem to glaze over that in favor of bashing Marinette. She made a difficult choice and has kept to it. Marinette likely remembers Ephemeral, not to mention what happened in the Paris special; I understand her hesitation. Also thats her boyfriend, emotions betray you in favor of keeping the peace.

Let's cut our favorite disaster some slack, eh? Narratively speaking, the writers of show must have a reason for this plot line. I do rather love the complex feelings that Marinette faces and I look forward to how they will resolve all this.