Does your partner act like Dr. Jekyll and Mr. Hyde? On my web site, I have a section titled Red Flags (https://www.boomeranglove.com/asp/redflags-20.asp. Here you can study over 80 behaviors that indicate the possible presence of Borderline Personality Disorder.
Dr. J. Kent Griffiths has spent over 30 years compiling his thoughts on what he considers to be a characer disorder/personality disorder. He has graciously allowed me to reprint his behavior list on both my web site and in my book Breaking Free from Boomerang Love.
Dr. Griffiths states that a character disordered person is different from everyone else by their "baseline' behavior -- meaning that they return to the deviant behavior over time.
All of us have bad days. Dr. Griffiths says that problems occur only when the majority of behavior is present and repetitive over time.
Check out the above Red Flags section of my web site and then return here to comment below on your thoughts.