Definition: In this task, you're given five sentences, numbered 1 through 5, and two options a and b for possible titles for the story. Your job is to choose the title that better fits the story. Indicate your choice by 'a' or 'b'.
Input: Sentence 1: My wife and I were very young when we started our family. Sentence 2: We fought often as young people do. Sentence 3: I caught her cheating on me. Sentence 4: She said she didn't tell me because it would hurt me. Sentence 5: I guess just not cheating never crossed her mind. Choices: a. The long movie. b. It never crossed her mind.

b