I been my my girlfriend for 2+yrs. Now and I know she suffers from bpd and I couldn’t do much back then but now that we live together I want to help out more. At the moment I reinsure her, I never rise my voice. Almost talk to her when I’m trying to comfort her like a friendly teacher. 
I have also noticed when it that time of the month her mood swings to the negative side of are 10x worse. 
Is there anything i should do to help?