That could work. But wouldnt that mean that both people just become friends instead of being in a relationship?

Although, being friends is also a kind of relationship.

The problem is when one person has misjudged ('miscalculated') or over-estimated another persons interest in themselves. You are right that people should be taught to not be so selfish after courtship fails, but people who think they have been wronged become angry and angry people are not rational.

Maybe a less angry society is the best preventative measure.