As Gia is walking into her senior prom, she gets dumped by her boyfriend, Bradley.
After her boyfriend leaves, she sees a guy in his car. She asks him if he can pose as her boyfriend, because her friends think her boyfriend isn't real and she wants to prove them wrong. He says yes.
She owes Fill- In- Bradley a favor, and he wants her to go with him to a party to make his ex jealous. Meanwhile, Gia is falling in love with him.
Gia watches a film her brother made and it mocks her. Her family is falling apart, and her friends figure out that she was lying to them. Her life is not at a good place right now. Hayden, the fill in Bradley, is emotionally hurting her.
Gia and Hayden make up, and realizes they are in love. Gia is trying to become a better person, and is making an effort to be nice to her enemy. But things with her friends are still not okay.
Gia is class president and when she gives her speech she admits she messed up. It still takes a while for her friends to forgive her but she has true friends, Hayden and Bec.