It's hubris.

All narcissists start to believe their own publicity. People around them are frightened to tell them the truth. They live in a bubble.
Witness all those sackings.

President Macron values his home life. He is on record as saying that he values his wife's counsel. She is, as he puts it, they only one to tell him the truth.

And given that she is a generation older than him, she has a lot to lose in misreading him.
That is some relationship, c'est magnifique.