It's not a straight forward answer. Some or all of those behaviors could be part of:
- immaturity,
- short term mental illness (e.g., depression),
- substance induced illness (e.g., alcoholism),
- a mood disorder (e.g., bipolar),
- an anxiety disorder (e.g., PTSD),
- a personality disorder (e.g., BPD, NPD, 8 others),
- a neurodevelopmental disorder (e.g., ADHD, Aspergers), or
- any combination of the above (i.e., co-morbidity).
Generally, each of the personality disorders has a characteristic emotional response pattern.
Some personality disorders are characterized by emotional sensitivity and a tendency to experience feelings with great intensity. Other personality disorders are characterized by little or no emotional response, regardless of the circumstance or situation. Yet another set of disorders are characterized by bouncing back and forth between these two extremes: from being overwhelmed with intense emotions one moment, to feeling numb and disconnected in the next.
The ten diagnoses in the DSM-5.0 represent ten specific enduring patterns of thoughts, feelings, and behavior. However, each of these ten patterns can be distilled down to four core features of personality disorders. In order to diagnose a personality disorder a person must exhibit at least two of these
four core features.
- Distorted thinking patterns (thoughts)
- Problematic emotional response patterns (feelings)
- Impulse control problems (behavior)
- Significant interpersonal problems (behavior)
The 10 personality disorders are: Antisocial, Borderline, Histrionic, Narcissistic, Avoidant, Dependent, Obsessive-compulsive, Paranoid, Schizoid, Schizotypal
Three of the core features are related to feelings and behavior. One is related to thinking and is often most challenging for partners and family members. Common thought pattern distortions are:
- extreme black-or-white thinking patterns;
- patterns of idealizing then devaluing other people or themselves;
- patterns of distrustful, suspicious thoughts;
- patterns that frequently include unusual or odd beliefs that are contrary to cultural standards; or,
- patterns of thoughts that include perceptual distortions and bodily illusions.
More here:
https://bpdfamily.com/content/what-borderline-personality-disorder