I am so sorry no one has replied to you.
Deciding whether to stay or leave is a very personal matter, but your safety and the safety of your baby is paramount.
There is a very good book to help you made a decision. It is called, "Should I Stay or Should I Go?: A Guide to Knowing if Your Relationship Can--and Should--be Saved," by Lundy Bancroft.
There is also a book on separating from a uBPD partner (undiagnosed) called, "Splitting: Protecting Yourself While Divorcing Someone with Borderline or Narcissistic Personality Disorder."
Both books can easily be bought online.
They are important reads and essential for anyone with a predicament to stay or leave an abusive R/S.
Threats to partners (of consequences such as leaving/divorce or other forms of emotional blackmail) are common with pwBPD.
Your mentioning "recruiting others" is called "triangulation" or the "Karpman triangle." It is a common tactic of BPDs to try to enlist others against their "target of blame." pwBPD or NPD try to enlist others into their game of character assassination once their partner is split black and devalued.
It is also common for those with BPD to be codependent with others, including family members and friends. This is because of the splitting, or "Jekyll/Hyde" aspect of the illness. BPDs are true chameleons, able to show a different face depending on the person being encountered. (This is also true with NPD. BPDs often have many NPD traits.) This is why neighbors, family and friends are unaware of how abusive a BPD partner can be.
https://bpdfamily.com/content/karpman-drama-triangleBe well and keep reading to gain knowledge so you can make the wisest decisions.
Hugs.