One Tree Hill

Season 1, Episode 19: How Can You Be Sure?

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Lucas must make a difficult decision regarding Brooke. Haley considers having sex with Nathan.

All Episodes - Season 1

Pilot
Episode 1
Pilot
 The Places You Have Come to Fear the Most
Episode 2
The Places You Have Come to Fear the Most
 Are You True?
Episode 3
Are You True?
 Crash Into You
Episode 4
Crash Into You
 All That You Can't Leave Behind
Episode 5
All That You Can't Leave Behind
 Every Night Is Another Story
Episode 6
Every Night Is Another Story
 Life in a Glass House
Episode 7
Life in a Glass House
 The Search for Something More
Episode 8
The Search for Something More
 With Arms Outstretched
Episode 9
With Arms Outstretched
 You Gotta Go There to Come Back
Episode 10
You Gotta Go There to Come Back
 The Living Years
Episode 11
The Living Years
 Crash Course In Polite Conversations
Episode 12
Crash Course In Polite Conversations
 Hanging by a Moment
Episode 13
Hanging by a Moment
 I Shall Believe
Episode 14
I Shall Believe
 Suddenly Everything Has Changed
Episode 15
Suddenly Everything Has Changed
 The First Cut is the Deepest
Episode 16
The First Cut is the Deepest
 Spirit In the Night
Episode 17
Spirit In the Night
 To Wish Impossible Things
Episode 18
To Wish Impossible Things
 How Can You Be Sure?
Episode 19
How Can You Be Sure?
 What Is and What Should Never Be
Episode 20
What Is and What Should Never Be
 The Leaving Song
Episode 21
The Leaving Song
 The Games That Play Us
Episode 22
The Games That Play Us
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