Sandra Bullock has finally spoken out about her partner Bryan Randall’s death three years later. The Oscar winner, 62, appeared on the “SmartLess” podcast this week and explained why she kept Randall’s battle with ALS a secret from the public. “He asked me not to share,” she said. “I know why he asked me not to.” However, Bullock admitted that Randall’s request “isolated [her] in the process.” Bullock explained that only her sister, Gesine Bullock-Prado, knew about Randall’s health battle, and the actress assumed she could “handle” leaving everyone else in the dark. However, dealing with her partner’s health crisis, on top of raising her…