DEAR ABBY: My dad died when I was young. He and Mom had a beautiful marriage. Mom was in a long relationship following his death and has been single for three years now. She has been spending lots of time with a family friend who lost his wife some time ago. They have known each other for years, even when Dad was alive. She goes over to his place for romantic dinners, they talk on the phone at least once a day, and he helps her with anything she needs around the house. He goes above and beyond to show ...