They met by chance at a dentist's office. Neither was searching for love, friends say. She had been through a divorce. His wife lived in a nursing home. The years had left him heartbroken and lonely, friends say. He bonded with the new woman over dinners and long talks. It was complicated, but they fell in love, friends say. Still, Michael Schiavo has always made it very clear: "He has one wife, and her name is Terri," said a family friend, Gloria Centonze. "He does not refer to anyone else as his wife, and never has." How, then, to explain...