Why might a relationship break up once it has entered Phase IV, the "right one" relationship, of the mate selection process?

Name: Why might a relationship break up once it has entered Phase IV, the "right one" relationship, of the mate selection process?
Brand: Quizplus
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Question

Why might a relationship break up once it has entered Phase IV, the "right one" relationship, of the mate selection process?

Quizplus · Accepted Answer

Phase IV is the stage where partners have chosen each other as the "right one" and are ready to commit to marriage. However, if they are unable to make this commitment, it can lead to a break-up despite being in a strong relationship.

Why Might a Relationship Break Up Once It Has Entered