DEAR ABBY: My wife and I have known each other for 25 years. We married five years ago. At that time, I was making 500-mile round trips twice a month to visit my children from my first marriage. I was, and still am, crazy about her. However, two years ago, my wife admitted to a long-term romantic affair with a married man who has two children. She also admitted that she was waiting for him to leave his wife, and that he was waiting for her to leave me before moving in and eventually moving away together, and perhaps marrying. Shortly after this came out, she became critically ill. She requires…