Boric Acid

I’ve been getting BV and yeast infections back to back really bad. My doctor was telling me it may be because my boyfriend keeps cumming inside of me all the time and I figure that is the problem because i’ve changed my eating habits and started eating yogurt and taking probiotics. My friend suggested boric acid and I was wondering can I use boric acid if I already have a yeast infection/bv?? Also is there anything else y’all suggest to get rid of it and keep it away?