Final answer:
It is true that relationships may end if partners cannot move the relationship forward into its next stage, as successful transitions are necessary for progression and deeper commitment.
Step-by-step explanation:
The statement that relationships may end because one or both partners are unable to move the relationship into its next stage is true. Relationships, like the breakage and formation of bonds, go through stages that often require both individuals to be willing and able to progress to deeper levels of commitment and understanding. Similar to getting married or divorced, the transition between different stages of a relationship can be seen as more favorable or less, depending on the ability of the individuals to handle the challenges and changes involved. This reflects a psychological understanding of relationships, comparable to theories like those of Sigmund Freud who suggested that failing to properly engage in or disengage from a specific life stage can result in lasting psychological consequences.