So can anybody say for certain why he strangled her in the final scene ? Because even on Evawiki it's unclear, in one place it says that it's because Shinji almost went insane because it took a long time until Asuka re-formed herself and he was alone for too long and in another place it says that it's because in Shinji's last interaction with Asuka he was strangling her.
Something about Shinji wanting to confirm that she is real or something
But I don't think it was that exactly
>anybody say for certain
>I know why
>doesnt validate statement with reasoning
Read as >I dont know why
That entire sequence is left entirely up to the viewer. Even the last words are simply what the voice actor decided to say. There is no definitive answer.