Christy is Eric's girlfriend in What I Meant to Say. After Cory says "I love you" to Topanga, she becomes very clingy and pressures Eric to say "I love you" to her. In the end, though, he cannot remember her surname.
After leaving Brenda Marsh because she was too experienced, Eric meets up with Christy. She seems like a much better fit, especially when she tells him of her trip to Pittsburgh, just like his the previous summer.