chrystie crownover told gma that bruce revealed his ` true self ' the year they were married in 1972 .
chrystie told gma that she has kept his secret for the past 43-years .
revealed she was shocked at first but was pleased he told her and ` never felt threatened '
told gma that she watched friday 's diane sawyer interview with bruce .
the olympic champion and chrystie have two children together and are grandparents .