'The Flash' Season 3, Episode 10 Trailer: Barry Tells Iris He Saw Savitar Murder Her In The Future [SPOILERS]

Barry (Grant Gustin) can't keep a secret from Iris (Candice Patton). In the trailer for Season 3, episode 10 of "The Flash," Iris figures out that there's something Barry is not telling her. And when she confronts him about it, the Scarlet Speedster is left with no choice but to tell her what he saw in the future. "The future has changed. I saw Savitar murder you," Barry reveals to his girlfriend in the time vault inside S.T.A.R. Labs.