this is from SingTao Daily (chinese newspaper sold in america) :
brief translation:
Japanese singer, Utada Hikaru appeared on a radio station in Tokyo, Tokyo FM, for an interview. Utada's song, "Come Back to Me", was about a girl cheating on her boyfriend. The radio host asked her if she really had an experience like this, she replied, "You can think that if you want". Utada reveals that she has cheated before, so that's why she wrote this song, but refuses to tell when this happened or whom she cheated on. Her confession shocked the 300 fans that were present at the radio interview. Also, her new CD comes out on the 12th of next month. She says, "My English lyrics are much more feminine."