Given the task definition and input, reply with output. In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.

Sentence1: Jack bought a ring for his girlfriend for Christmas. Sentence2: When he brought the box out her face looked panicked. Sentence3: She told Jack she didn't want to marry him. Sentence4: Jack sadly told her it was not an engagement ring.
Jack decided to break up instead of giving her the ring.