Hi JustJillian,
I'm sorry that you are experiencing this. I was married for seven years to a man with undiagnosed BPD that was violent with me and extremely jealous. Many of the things you describe sound like what he would do to me, listing off all real or imagined offenses, relentless texting and calling, demands on my time, etc.
It's really good you are going to see a therapist. You absolutely need some real life support for this situation.
As for what you can say or do to get him to back off... there is probably not anything that is going to stop his behavior. He would need to seriously commit to treatment and honestly face the issues he is having and then implement the treatment plan in order to see lasting behavioral change.
You may have seen this in scarletlavender's thread, as I noticed you posting there, too, but I will link these again:
Duluth ModelMosaic AssessmentAdditionally, for both of you (JustJillian and Scarletlavender) you can call or chat anonymously with a trained advocate at
www.thehotline.orgNot everyone with BPD is physically abusive, and not all abusers have a personality disorder. These are two separate issues that, when combined, can seriously compromise the relationship and your safety.
Another couple of good resources I suggest are the books "Why Does He Do That? Inside the Minds of Angry and Controlling Men" and "Should I Stay or Should I Go?" by Lundy Bancroft, a renowned expert on abusive men who worked with domestic violence offenders for many years.
How would you feel about calling the police the next time he physically intimidates you?