Regardless of which superhero were talking about, these days it seems that it takes only something minimal in order for a hero to take off his mask and reveal his true identity to someone. In Enter Zoom, we get to see Barry de-mask in front of Linda as a show of trust. First it was Joe who found out the truth about Barry, then Iris and Henry followed later on in Season 1, and now Linda. That leaves Patty Spivot as the only person close to Barry who doesnt know that he spends his spare time speeding round Central City and fighting bad guys. In fairness, Linda seemed to take the reveal all in her stride before excitedly proclaiming: Ive made out with The Flash!