A sports reporter says she learned her boyfriend was cheating on her after noticing a spike in activity on his Fitbit. Jane Slater, 38, a correspondent with the NFL Network, tweeted, "an ex-boyfriend once got me a Fitbit for Christmas. I loved it. We synched up, motivated each other... Didn't hate it until he was unaccounted for at 4am and his physical activity levels were spiking on the app." "Spoiler alert: he was not enrolled in an OrangeTheory class at 4am," she continued.