bad story and awful ending

so basically the whole point of the story is her being a cheater and her partners just NEED to accept it...... wtf? I don't get it how she even had that many people liking her at work, she could be nice to people she had no romantic interest but her whole love story just proves she's a bad person, and she doesn't regret it!? In the end, I thought she would finally be a decent human being but she still had another whole boyfriend at the same time, wtf
this story was so bad, but it's what they say: once a cheater, always a cheater.