The Gorgeous Isle by Gertrude Atherton

Anne could never recall just when it was she discovered, or rather divined, that her husband was once more a dual being. A vague sense of change cohered into fact when she realised that for some time he had been reading aloud and pursuing an undercurrent of independent thought. His devotion increased, were that possible, but the time came when he no longer could conceal that he was often absent in mind and depressed in spirit. He took to long rambles in which she could not accompany him at that season while so far from robust, smilingly excusing himself by reminding her that being so much more vigorous than of old he needed a corresponding amount of exercise. There finally came an entire week when he was forced to remain indoors, so persistent were the torrential rains, and after the first two days he ceased even to pretend to read, but sat staring out of the window with blank eyes and set lips, at the gray deluge beating down the palm trees.

He came to the table and consumed his meals mechanically. Nor was he irritable. The gentleness of his nature seemed unaffected, but that his mental part seethed was autoptical. If he was less the lover he clung to Anne as to a rock in mid-ocean, and if he would not talk he was uneasy if she left the room.