Apart from this, Nan avoided him as much as possible, treating him with a cool, indifferent reserve he found difficult to break down.

At least, he made no very determined effort to do so.

Perhaps he was even a little ashamed of himself.

But it was not in his nature to own himself wrong.
Like many men, he had a curiously implicit faith in the principle of "letting things blow over." On occasion this may prove the wisest course to adopt, but very rarely in regard to a quarrel between a man and woman.

Things don't "blow over" with a woman.