Lavinius wrote:You just don't seem to get it.
I'm asking for more in-depth answers than the obvious...
*Waits for Bagheera*
Hmmm. Others are right in that she seeks Kaji as a means of securing her identity as an adult in her mind, but of course that in itself is a means to an end rather than an end in and of itself. What she really wants is security. She was discarded by her mother before she died, and betrayed by her father at an early age; that triggered in her a quest for independence and a relentless desire to become recognized as an adult -- if she's an adult she'll be accepted and valued, and she will no longer have to worry about being victimized and abandoned.
Kaji is "safe". She knows he'll never take her up on her offers, but she also knows (or thinks) he takes her seriously. She talks about being ready for kissing and "other stuff" but of course she's not -- what she really wants from him is for him to help her project an image of maturity and sophistication, so that others will see the person she wants to be and help her become that person. "If one does as God does enough times, one becomes as God is." Same idea here. This is also why she rejects her peers -- in her mind they're children, and thus useless to her. She needs an adult because he'll be able to protect her and give her the stability she craves. Never mind the fact that the adults around her are just as lost and broken as she is, of course . . .
Her Eva piloting plays into this as well, and it's easy to see why Shinji's success is so terribly threatening to her during the descent arc -- if she's not the best she's afraid she'll be cast aside the same way she was as a child, and of course that's exactly what happens. Kaji's death affected her so strongly not because he was a lost love interest, but rather because he was the last one who could protect her against the adults who had no use for her. But that was never a role he agreed to play, and he never knew how to make her understand this without betraying her trust. So he just put her out of his mind and focused on playing spy, opting for abandonment over betrayal.
That's the short answer, at least as I see it. There's a lot to unpack there regarding matters of independence, what she wanted from Shinji, why she was looking to these two men for answers in this arena, how it relates to the show's central themes, and so on, but that's all ranging a bit beyond the scope of the thread.