Unsure of my sex life

I have been with my husband for 12 years now and I recently was feeling a little weird in my lady parts. I thought maybe it was the shower gel I used wasn’t sure. We went to have sex that night and there was a slight odor. So I went to the dr and found out I have BV which my dr told me was likely a result of my copper IUD. I went to explain this to him but he says he thinks I probably cheated on him and has some kind of std. I’m always with our our 1yr. Old so I don’t have time to do anything. I’m just lost at what to do because I know I’ve never stepped outside of my marriage and I also know BV is very common. I just need some advice.