The City on the Edge of Forever
You don’t have to agree with me on this one, because I know its a long shot.
I always get the feeling that Edith Keeler has this… resignation through the whole episode. Like she knows Kirk fancies her but, in the end, he will leave her. For Spock. Even if Kirk doesn’t even realize it at the time. Like, she’s the first person who can clearly see this connection between them and she knows she won’t achieve it with Kirk, specially after she asks him to let her help and he simply shoves her off. And then, she says “and you, like you’re always gonna be by his side ” and she has that look on her face, that spiteful expression on her face, while talking directly at Spock… Almost like jealousy. I believe that she is jealous because Kirk likes her and yet he’s leaving her, she knows their (Kirk and her) relationship is only momentarily, and that when he leaves, he will leave with Spock.
Idk, this is supposedly an episode where Kirk falls in love with a girl but it’s really about THEM BEING IN LOVE AND NOT EVEN NOTICING IT BUT SOMEONE ELSE DOES