Hi Alice2017

I'm sorry you can't trust your partner and you get accused of things. Of course it is tiring.
How long have you been in this relationship? Is he diagnosed as having BPD? Have you been reading about it? What are your goals here?
I'm sorry for the battery of questions, I just don't know anything about your situation in order to offer some support. Everything you say sounds so familiar, and it keeps you off balance and sad. Learning about new tools of comunication and understanding BPD can improve things a lot. Specially, we can change things so WE feel better, while at the same time we make things safer and more comfortable for our loved ones.
Best of luck.