Help with BV‼️

So I’ve been dating this man for months and every since we started having sex i would get bv which I’ve never had in my life. I know he’s not sleeping with other people so it’s not that. The thing is he is a weed smoker so I’m thinking could it be because of the bacteria in his hands and mouth from smoking weed??? because he would usually smoke before we have sex

I be shy to tell him about this🤦🏽‍♀️