Time passes; life goes on.
She throws herself into everything (church choir, Glee club, school) to distract herself from the fact the quarterback and the girl are getting married. It kind of works.
"We're kind of friends, huh?"
Somewhere down the line, Dave Karosfky tries to kill himself, and while she feels horrible for him and his family, she can't help but try to stay distant, because it's really, really rude to be jealous of a suicidal boy.
(But she is. At least his father loves him. At least people accept him and are trying to understand him. At least he's honest about who he loves.)
So she remains distant, and no one's really phased by her attitude (no one's ever accused her of having a heart anyways.) But then Kurt Hummel gets offended by her distance and goes off on her, telling her that she has no idea what's it like to hate yourself for your sexuality, that having a baby isn't real pain compared to being gay.
She'd laugh if she had the energy.
So she acts like a bitch, and nobody defends her, and soon everyone seems to forget the fight even happened. She replays it in her mind over and over for the rest of the day.
Regionals comes. She dances in the background, sings in the background, and pretends to care when they win.
But then she sees the girl, and she realizes that this wedding is happening. The quarterback won, and there's nothing she can do. So she asks to attend the ceremony, because at least then she'll get to see the girl she loves in a wedding dress.
Fate has a different plan. She runs a stop sign. A truck crashes into her.
She's dying, and she can't help but laugh. She was right for being jealous of Dave.
She's never wanted to live less.