Hi ander19,
I can so relate to your post, especially this:
I have stopped telling her anything really good (like a job promotion) because she has no excitement for me. I have stopped telling her anything bad (like I got a flat tire or my best friends mom is very sick) because she has absolutely NO empathy. I have started to just keep conversations very surfacy to avoid my own disappointment.
I think that when my uBPDh sense my excitement about something, he somehow subconsciously wrecks it for me. Like once I had a teeny online business, and I was quite happy about it (not earning much but I like to share stuff I've created with others). He initially seemed supportive, but then in moments of rage he would say I have put all my time in the business (which is not true. I barely put in any time. I promoted it on Facebook with my phone when I was commuting.) and have ignored his stuff. So now I have resorted to doing certain hobbies in private, and not sharing anything with him. It's sad because I would've like his input, but I also know that if I had shared it with him, the project would promptly end.
As for empathy, I think that it fluctuates A LOT for him. When he's Dr. Jekyll, he's very empathatic. When he's Mr. Hyde, not at all to the point it's scary. I remember he was mad at me once when we're out, many years ago. A pervert dude basically deliberately ran into me so he could feel me up. H (bf then) was walking next to me and he could see that I was shocked and absolutely disgusted, but he ignored it and continued raging at me. It was almost like he felt that I deserve the harassment and was happy that somebody else was also attacking me. That made me really sad because aren't you supposed to protect somebody you love?
I can't talk feelings with H as well. He would just get defensive and immediately start attacking me. Whatever slightly negative feeling I convey (even stuff completely unrelated to him) he would attack me by saying "So I do everything for you perfectly and still it's not enough for you? You still can't be happy?" So yeah, I end up feeling even worse than before I share it, because now I've got to deal with him as well.
On the plus side, I've gotten awesome at self-soothing, I must say...