Only a qualified mental health professional can diagnose BPD or any other mental health condition after a comprehensive evaluation.
However, I can provide some insights based on the information you provided. Difficulty in maintaining long-lasting relationships and engaging in self-sabotaging behavior may be indicative of various issues, including possible emotional or psychological challenges. These challenges could be related to attachment styles, unresolved trauma, anxiety, or depression, among other possibilities.
If you are experiencing distressing emotions and behaviors that are affecting your daily life, relationships, or overall well-being, I highly recommend seeking support from a mental health professional. A therapist or psychologist can conduct a thorough assessment, listen to your concerns, and provide appropriate guidance and support.
Remember, seeking help is a sign of strength and self-awareness. Mental health professionals are trained to help individuals navigate their emotions and develop healthier coping strategies. If you're unsure where to start, consider reaching out to a mental health hotline or your primary care physician to discuss your concerns and get a referral to a mental health specialist.