Check out this link from Ashley Berges on the topic: https://youtu.be/Xykqh2jgtZk
and THIS one by Michelle Lee Neives
It's not a healthy thing to be in a relationship with someone who has this disorder UNTREATED. If someone is in treatment and showing signs of applying what their therapist and support group is teaching them, and if you are a strong person in yourself, then go for it.
As for me, I have been trained in this and still do not choose to be super close to people who are untreated and have this problem.