It's immoral to cheat on your partner.
Devin met a new female coworker at work who reminds him of his fiance.
Devin wants to learn more about his coworker.
Devin invites his coworker over to his house to spend time with him and his fiance.
Devin asks his new coworker out to have dinner on a date.
Devin and his fiance become friends with the new girl at work.
Devin's fiance finds out about his dinner date and breaks off his engagement.