Already happened. They adopted a baby first. Now she is with another woman.
So this woman, who would benefit greatly from having a devoted and helpful spouse to help her cope with the loss of her eyesight, flushed all that away for a brief fling with the babysitter.
How this is story is anything but tragic is beyond my understanding.
Maybe her ex-husband will be a stand-up guy and take her back, which would be far more than she deserves.