Mind freak movie with unsatisfying ending

Rating: 9/10 (22 May 2015)

This movie was amazing; the acting the concept the effects the execution perfect except for the ending. Basically caleb thinks he's in love or infatuated with her and she the same except she uses Caleb to escape and leaves him behind locked inside. And then it ends. Unsatisfying here's what I think should have happened. To get out they need Nathan's card and Caleb tells Ava this. However he ponders what Nathan says about Ava using him to escape. So he reprograms it so that it not only does the system not read Nathan's card but it recognizes Caleb card being the master controller. Thus revealing Ava's true plan. I'm not saying that the ending was the worst in fact it does fit the theme of the whole movie but it's still so unsatisfying.