No one is forcing her to listen to it.. If you tired her up in a room and made her listen to the song on repeat than I could understand. If you have things you need to express than I think you have every right to do that, whether you chose to share your experiences or keep them private amongst the two of you, that's your choice. As long as your careful not to get caught in a defamation of character issue, do your lyrics claim anything about her.. like, "Mandy, your a cheating bag, and I hate you for killing our dog. Your a sociopath and a lesbian and you eat old socks for lunch." I think your okay. LOL