What does it mean when someone is on the borderline?
He's between two different states of health or behavior.
http://www.google.com/#q=borderline+definition
What is the context of this use of borderline?
I'm talking about money when a person is almost destitute. Is that context okay?
He's on the borderline between being destitute and able to support himself.
Yes.
Being "on the borderline" typically refers to someone who exhibits traits, behaviors, or characteristics that fluctuate between two different states, often extreme ones. This phrase is commonly used in psychology, specifically in relation to Borderline Personality Disorder (BPD).
Borderline Personality Disorder is a mental health condition characterized by unstable moods, relationships, self-image, and impulsive behaviors. People with BPD often struggle to regulate their emotions and have intense fears of abandonment. They may exhibit alternating patterns of idealization and devaluation towards others and themselves. These individuals often experience difficulties in maintaining stable relationships and maintaining a consistent sense of identity.
If you suspect someone is on the borderline, it's important to approach the topic with empathy and sensitivity. Encourage them to seek professional help from a mental health expert if they are experiencing significant distress or impairment in their daily functioning. A qualified therapist or psychiatrist can provide a proper diagnosis, as well as develop an appropriate treatment plan tailored to their specific needs.