Class Ring — Josephine Wunsch

SHERRY LIKES JILL, AND SHERRY'S BOYFRIEND LIKES HER, TOO...

Jill breezes into Sherry's life one spring day, and after that nothing is the same. Sherry is fascinated by her and introduces her to all her friends.

So she's shocked when Jill starts spending time with Kent. He's Sherry's boyfriend. They've been going steady for a year, and Sherry even wears his class ring.
But Jill is serious about Kent, and soon he stops calling Sherry or mentioning the prom. Sherry wonders if Kent ever loved her at all....