You ask 10 different people about the ending(s) to Eva, and you\'ll get at least 12 different responses.
Effectively, the endings to Evangelion are what you make of them.
With the end of the series, it seems that Shinji accepts Insturmentality.
With End of Eva, he appears to reject Insturmentality as being a cop-out. IMO, this happens after his apparent acceptance in the series. He realizes how fake it all is. How false his happiness is. He realizes that, despite everything that\'s happened to him, it\'s more important to be a depressed human than a mindlessly happy puddle of LCL.