I tried not to analyze this or try to judge..... I believe he loved both women sincerely and honestly. It's believable and possible. Besides, the type of person he was, no way could he have left his wife, not in his DNA.
Besides, The scenery and Kentaro makes it more than worthwhile. what a gifted actor!!! Says more without words ....
For me, the movie should have ended when he died. Nothing after was meaningful nor necessary.
Now that I've seen this several times, I start crying immediately....from when the wife cries in the car..
By the way, the feelings you get is not cheating, for heavens sake. You can't help the feeling!!! When it turns into action, that's cheating.