DEAR ABBY: I am single and the mother of a 7-year-old girl. When she was 4, I decided there would be no parade of guys coming in and out of my life, or any at all. I have barely dated, and the few times I have gone out, I never talked about it around her. Over the last two or three years, she has come home every few weeks or months with a new boy she likes. I never say much except that she’s not allowed to have a boyfriend. She recently swore her grandfather to secrecy and told him ...