Elton John’s ex-wife is reportedly demanding $3.8 million as she claims he breached their divorce deal by publishing a memoir.According to British newspaper The Sun, Renate Blauel, 67, is suing the Tiny Dancer singer after the star wrote about their four-year marriage in his recent autobiography.Last month, news broke that she was seeking a mystery injunction against the 73-year-old – and sources claim she is now suing over the book and its triggering of long-standing mental health issues,