One that is in love will only recognize the good object of their love, and typically for a while at least be not capable or extremely reluctant to recognize the rest. This occurrence is called splitting, and is measured a much undeveloped defense instrument (19 Borderline Personality Disorder: A Theory of Borderlines, 2010).

Splitting seems to be the major defense apparatus of the borderline. A borderline sees others in expressions of black and white or as good or bad. The major difficulty in treatment of borderlines is to manage their impractical visions of other people and in their efforts to generate self satisfying predictions to make everything else fit with their insights. If a borderline thinks one as a superior object, they will go to immense actions in supplying circumstances or accepting this outlook (19 Borderline Personality Disorder: A Theory of Borderlines, 2010).

References

19 Borderline Personality Disorder: A Theory...
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