Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: I turned twenty years old. My girlfriend didn't realize it was my birthday. I tried to drop hints but she didn't get the message. Then I shouted at her for not remembering my birthday. I realized she was not worth the time so I dumped her.
 selected sentence: I realized she was not worth the time so I dumped her.

She forgets my birthday >Causes/Enables> I dump her