In this task, you're given a context passage. Your job is to generate relevant questions that can be answered by directly referring to the passage.

Example input: Tracy slept awkwardly on their new bed and was having some pain, so Tracy cracked her neck.
Example output: What did Tracy do with her neck?
Example explanation: The question asked is relevant and can be directly answered by referring to the phrase "so Tracy cracked her neck" from the passage.
Q: He could hear the whispers as he passed each group to get to his locker and outwardly he ignored them all . Inside , he was a mix of hurt and anger . She'd done it again . Lilly had cheated on him again and he was pissed , just as he always was when he found out about her little flings .
A:
What's a possible reason Lilly cheated on him ?