chunk: Tensions arise between Ali and Jack as Marcus grows increasingly infatuated with Ali, making Jack jealous. At Georgia's wedding, Jack appears to call off his engagement, getting drunk. That night, Ali and Jack sleep together, but the following morning Jack's fiancé, Natalie (Agron), returns unexpectedly from her play in New York and tells Ali that the engagement is still on. Jack denies this, and while trying to fix things, he asks Ali to leave. Feeling heartbroken and betrayed, Ali runs to Sean for support, who prompts her to go with Marcus after his phone call.