Hello Sebastian,
Mayo Clinic defines BPD as ... .
Cluster B personality disorders
Cluster B personality disorders are characterized by dramatic, overly emotional or unpredictable thinking or behavior. They include antisocial personality disorder, borderline personality disorder, histrionic personality disorder and narcissistic personality disorder. It's not necessary to exhibit all the signs and symptoms listed for a disorder to be diagnosed.Borderline personality disorder
Impulsive and risky behavior, such as having unsafe sex, gambling or binge eating
Unstable or fragile self-image
Unstable and intense relationships
Up and down moods, often as a reaction to interpersonal stress
Suicidal behavior or threats of self-injury
Intense fear of being alone or abandoned
Ongoing feelings of emptiness
Frequent, intense displays of anger
Stress-related paranoia that comes and goes.
BPD as defined by John Hopkins Medical ... .
For people without a personality disorder, personality traits are patterns of thinking, reacting, and behaving that remain relatively consistent and stable over time. People with a personality disorder display more rigid thinking and reacting behaviors that make it hard for them to adapt to a situation. These behaviors often disrupt their personal, professional, and social lives.Examples of dramatic/erratic (Cluster B) personality disorders
Borderline personality disorder. People with this disorder are not stable in their perceptions of themselves, and have difficulty keeping stable relationships. Moods may also be inconsistent, but never neutral. Their sense of reality is always seen in "black and white." People with borderline personality disorder often feel as though they lacked a certain level of nurturing while growing up. As a result, they constantly seek a higher level of caretaking from others as adults. This may be achieved through manipulation of others, leaving them often feeling empty, angry, and abandoned, which may lead to desperate and impulsive behavior.
Narcissistic personality disorder. People with this disorder present severely overly-inflated feelings of self-worth, grandness, and superiority over others. People with narcissistic personality disorder often exploit others who fail to admire them. They are overly sensitive to criticism, judgment, and defeat.
BPD as defined my a Harvard Medical study ... .
BPD is believed to emerge from an interaction between genes and environment. The major twin study showed that genes accounted for 69% of the variance in diagnostic concordance. This concordance rate is similar to that found in bipolar disorder and stronger than rates for depression or anxiety. Functional MRI studies of BPD patients show abnormalities in the amygdala (an almond-sized and shaped brain structure linked with a person's mental and emotional state) and the prefrontal cortex (a part of the brain associated with planning, reasoning, solving problems and regulating thoughts, feelings and behaviors).Borderline Personality Disorder (BPD) is a severe mental illness seen in approximately 20% of inpatient and outpatient clinical samples and between 1.2% and 5.9% of the general population. It can co-occur with other disorders, but studies of its heritability, diagnostic validity/reliability, and of specific treatments indicate that it is best considered an independent disorder that negatively affects the patient's treatment response to comorbid disorders, particularly mood disorders.
Borderline Personality Disorder is severe and can be lethal, with an estimated 65-70% of individuals making at least one suicide attempt and 10% dying by suicide. Persons with BPD are high utilizers of treatment, especially emergency departments and inpatient hospitalizations - the most expensive forms of psychiatric treatment.
With all of that being said ... .we can't & won't tell you what you should think or do ... .we can educate you on the Cluster B mental illness ... .what we have experienced ... .I can tell you from not one but 2 exBPDgf that everything you wrote is very common in the world of BPD. You saw

... .with everything that you have read & learned ... .and with the definitions above ... .what does your logical thinking tell you?
J