You DO NOT know what´s going on in her batchit crazy head, if you knew you already would have initiated No Contact for a lifetime.
I can tell what is going on, she is happy to see you suffer and she plays you with a sadistic smirk. Why? Cause it´s her way to relieve her inner pain, a pain that was caused by a trauma long time ago in her early childhood. As
@Infern0 already stated, emotionally she is basicly a child in a woman´s body. That trauma that happened to her long before you came into her life and she survived it. She is a professional surviver, so there is no need for having compassion for her, or saving her, because she doesn´t want to be saved. She´s also a professional victim (suicide blabla, please save me I´m a whor...er...damsel in disstress...). Why do you have so much compassion with a person that is so self-centered, playing mindgames with you and doesn´t give a f>ck about you? She abuses you emotionally and she knows it, because it makes her feel better. But she doens´t know how much pain she causes to you and never will becuase first of she´s so self-absorbed in her own inner pain and secondly she never developed the competence to feel compassion for others. Her emotional development stopped before that and didn´t progress, albeit she needs compassion and love from others to survive:
I think
@stovepipe puts it straight here.
Why worry for a person that abuses you?
A wise decision this will help you to get out of this sh!tty situation much faster.
Regarding the intense shame you feel at the moment for being needy I can relate, never felt so much shame for being needy as I did after the break up with my sith-lady. But there is really no need to blame oneself for it. It´s called toxic shame from ones own childhood. I´d recommand reading
Shari Schreiber´s articles about BPD or better reading the book "No more Mr. Nice Guy" by Robert A. Glover. He also mentions toxic shame. Reading that book might distract a bit better from your obsessive thoughts about your ex than reading mor about bpd. She didn´t choose to be like that. Don´t feed her with your thoughts or any contact, she will survive just fine without you, she learned it early on as a child. It´s only about your own sake now.