That is all great advice and I believe so true. My former close friend turned stalker showed all of the BPD traits along with Narcissism. He expressed a romantic interest in me which I did not return and he began to show these trait quickly thereafter and to an overwhelming degree. I begged him repeatedly to go back to his therapist. He had never gotten any sort of diagnosis that he or I was aware of. I went from gentle asking him to go back to therapy to begging to outright demanding if he wanted to continue to associate with me. I even contacted his therapist to share what was going on and how he needed therapy from a proper clinician and not a friend who just happened to have an MS in psychology. She essentially blew me off and wished us well as a couple. I later learned that he basically filled her with his delusions of some perfect, loving fantasy relationship.

Anyhow, your loved one has to be able to acknowledge that they have an issue and want to seek help. My friend never did and adamantly clung to the belief that only I could help him and if I would just fulfill his bizarre paraphilas and be his baby factory, he would be healed.