re: Avenger: AoU Reviews (**MAJOR SPOILERS**)

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By the end of Iron Man 3, he not only seemed like a different Tony Stark, he also hinted that he was no longer Iron Man.

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Then you misread the ending of IM3. The ending of that film is that TONY STARK IS IRON MAN, which is why he destroys the multiple clones of his armor. He's losing his humanity to the suit. This fell in perfectly with the ending of Iron Man 3, as well as his struggles with the Chturi Invasion. He's still obsessed with that horrible moment. It drives his decisions in the first half of this film (and all of IM3).