Hi Mary Jane,
I am glad that you found us. You have come to the right place for help, support, and the tools to learn how to improve your relationship.
I understand how erratic and dramatic behavior is confusing and frustrating. Before I learned about BPD, I was completely baffled by my bf's behaviors. Learning about BPD behaviors and characteristics helped me understand my bf's paranoid feelings, fear, and rages.
People with BPD (pwBPD) tend to have a poor self-image/self-esteem, low self-worth, self-loathing, and inherent feelings of shame. The combination of all these factors can lead to insecurity, jealousy, and fear of rejection. PwBPD have a very hard time controlling and regulating their emotions (dysegulation). PwBPD are hypersensitive to their emotions and can quickly vacillate emotions. In addition, pwBPD tend to have a high negative affect (negative emotions/feelings such as anger and sadness). A pwBPD's life is completely based on their emotions. When a pwBPD is feeling a certain way, they tend to perceive these feelings/emotions as lasting forever and believe that feelings are facts.
My bf's extreme self-loathing and poor self-image/self-esteem makes him prone to be jealous and thinking that he is unworthy of me. Many times he self-protects through avoidance and emotional distancing, because he thinks I will eventually reject him or leave him because he is not good enough. Also when he thinks I am not there for him enough or don't love him enough, he perceives it as a form of rejection/abandonment. When that happens, he reacts in anger, bitterness, or with sarcasm. He will project his angry feelings on to me, which ultimately causes him to feel shame/guilt later and his belief that he is a "bad" person. It is cycle of self-destructive behavior.
I learned before I can help my bf, I need to learn to help myself first. It is easy to forget about ourselves and our needs while in a relationship that can be emotionally taxing. I found having a support group of my friends, family, and psychologist really helps. Do you have a support system?