A healthy attitude to a relationship makes the other person an end in herself.
What does it mean for a person to be an end? In the example, is the end the continuity of the relationship, her happiness, or what?
If the end is the continuity of the relationship regardless of quality, or her happiness regardless of his, it doesn't look very "healthy". But if it's conditional on quality or on his own satisfaction, it doesn't look like the "end".
What does it mean for a person to be an end?
It means that this person's happiness/wellbeing is your terminal goal.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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