When Lina Misitzis was a teenager, she told people she was dying. She wasn't. But, an entire genre of "dying girl gets the guy" movies taught her that landing a boyfriend required a certain brevity on this planet. She only lied to men, men she wanted to be with.
That was more than ten years ago, but the guilt of exploiting imaginary illness for (failed) romantic gain stays with her to the present. Julia Wallace, her therapist, thinks that Lina can overcome this guilt by re-writing the story of her teenage years, by calling three people she wronged and telling the truth. So, Lina does.