Dear Infinit149,
It's difficult to see clearly, when the world is out of focus. Being under the influence, may help get you through these troubled waters and reduce your feelings, but in the long run sorting things out will just take longer. Taking care of yourself starts with you. As a caregiver (son and cat), you know that they depend on you to be there, right? Think about what that takes, and do it for you, and for them. As far as your SO, he's on his own path. Sometimes it's the same one you travel, and sometimes not. Regardless of his actions or reactions, this road you are on is your life, not his. We welcome others to be with us, but having a pwBPD in our lives means that we are sometimes alone. Your son, and kitty are there (I have kids and a trusty dog), and that is far more than most have. You also have an education (think about finishing that Masters degree), that no one can ever take away from you. I just finished my BA last year and will be going into Graduate school. It is never too late, and it's a gift you can give yourself.
Perhaps I'm just too sensitive emotionally as he knows exactly how to push my buttons and keep me at a distance... . I know I wrote a lot and I'm not having a very good day as he has been making me miserable blaming me twisting reality to fit his hate towards me.
Being sensitive is not a weakness. After being emotionally traumatized it is natural to feel 'raw' after a rage. My husband tries to turn it all on me, and says that all we do is fight. I know that this is a battle in his head, and not a real one. They are in the dark, and they run on fear. When you mentioned that you were reaching for the light, that's all it takes. The more you understand about BPD how to react (not JADE), it will change. He will be less controlling, because your will find a way to take the power back. We are the ones that give it to them, and we are the ones that can take it.
One of the first things I learned to do, was to not engage in crazy behavior. For some reason, when my husband was going crackers it made me feel that way too. I had to stop, and calmly and quietly recoil. Sometimes it was a slow walk out of the room or a scamper when things were being thrown. You will get there and things will get better.
Keep reaching for the light. It dispels darkness.