I tested positive but my partners tested negative.

I’m posting anonymously because I just don’t want anyone to know … I’ve been in a poly relationship for a few months, I got tested dec 27th and was clean of everything besides BV, which is fine because I’m very prone to BV (I’m super sensitive) well fast forward to Jan 19th, I went to the gyno because I was sure I had BV again. I had got the full on testing of everything just to be safe. Results came back positive for BV and positive for chlamydia.. I’ve only been with these 2 people (1girl 1guy). The last time me and the girl had sex was in October, and since then I’ve only been having sex with the guy (my boyfriend). They both went and got tested January 21st and it came back negative for them both.. I’m at such a loss because now fingers are being pointed at me and I’m struggling so bad because this doesn’t make sense to me at all… I haven’t had sex with anyone else or done anything with anyone else.. is it possible this could be a false positive?? Im on the meds for it & I know it’s only spread through sexual contact/intercourse.. please help