Much like Barry Allen had more than one chance to battle Reverse-Flash during this episode, he also had more than one chance to stop Patty Spivot from leaving Central City. After piecing the puzzle together, not to mention Joe Wests poor attempts at a cover-up, Patty realises that Barry Allen and The Flash are one and the same. So much so, she even confronts Barry on it and explains that she understands the whole situation, the problems and torment he must be going through, and that if he admits that hes The Flash then shell stay in Central City. Ever the hero, Barry chooses to keep schtum, meaning that Patty will be out of his life and will no longer be someone who could be targeted by supervillains.