The X-Files, Season 7

Scully:
(about to cry) I don't know what to believe anymore. Mulder, I was so determined to find a cure to save you that I could deny what it was that I saw and now I don't even know... I don't know... I don't know what the truth is... I don't know who to listen to. I don't know who to trust. (pauses; is crying) Diana Fowley was found murdered this morning. I never trusted her... but she helped save your life just as much as I did. She gave me that book. It was her key that led me to you. I'm sorry... I'm so sorry. I know she was your friend. (she puts her arms around him; they hold each other)

Mulder:
Scully, I was like you once. I didn't know who to trust. Then I... I chose another path... another life, another fate, where I found my sister. The end of my world was unrecognizable and upside down. There was one thing that remained the same. (gently holds her face; looks in her eyes) You... were my friend, and you told me the truth. Even when the world was falling apart, you were my constant... my touchstone.

Scully:
And you are mine.

[They move their faces close together; Scully kisses him on the forehead for a long time. They pull slightly apart; Scully puts his hat back on his head, cups his face in her hands. They look in each others' eyes before she gently touches his lips with her fingers before leaving. He stands in the doorway and closes his eyes.]