Alex, Lisa's old neighbor and friend. Alex had fallen in love with Matt from afar, but he met and fell for Lisa before Alex found the courage to speak to him. The man from the newspaper was stalking Lisa, and Alex agreed to swap apartments with her for a few days before Lisa left for a new job in London. Luke persuades Matt to come with him that night to see Alex perform in Twelfth Night. She is unrecognizable in stage makeup, but panics after she sees Matt in the audience with Luke. Matt returns to the apartment, feels the real Lisa's presence in spite of its emptiness, and spends the night. Alex sleeps with Luke that night; in the morning, when Matt calls Luke, she answers the phone then drops it in a panic. She overhears Luke say Matt is at the apartment, and runs out to call him and meet him there. After receiving Matt's note at the restaurant, the real Lisa calls and asks Luke to tell Matt to meet her at three o'clock, saying he will know where. When Alex arrives at the apartment, Matt gives her another pair of red-soled shoes, Lisa's size, but they are too big. She realizes he suspects something, but Matt says he can exchange them and leaves. Alex then calls Luke and asks him to meet her at the restaurant. Now suspicious, Matt follows "Lisa" (Alex), bumps into Luke, and follows him into the restaurant to finally meet Alex, the girl Luke is in love with. Matt confronts Alex, her deception revealed. A flashback reveals that two years ago, the same day that Matt asked Lisa to move in with him, Lisa was offered a last minute job touring with a show in Europe and had to jump on a plane. Lisa had given Alex a note to deliver to Matt, telling him she loved him and wanted to live with him. Instead, Alex had kept the note, deleted all the messages Lisa had left for Matt on his answering machine, and told Lisa that she had caught Matt in bed with another woman. Matt never learned why Lisa left, seemingly without a word. In the present, a confused Luke tells Matt that Lisa called and wants him to meet her at three o'clock before she returns to London. Matt is unsure where to meet, but Alex gives him Lisa's