El amor (primera parte)

Why do two people fall in love? When do they become a couple? How do they decide it's time to live together? At which secret moment, imperceptible things anticipate the breakup? When does the relationship end and when should it end? The story of a young couple, from its beginning to its ending, from the excitement of falling in love to the dark and dull days before the breakup. (cinenacional.com) (Summary by mariand)