In Tina Knowles’ new memoir Matriarch, Beyoncé and Solange’s mother admitted that she had an affair with ex Mathew Knowles after she filed for divorce in 2009.  Tina Knowles took one step to the right after telling Mathew Knowles to the left, to the left.  In her new memoir Matriarch, out now, Beyoncé and Solange’s…