Best Head but issues afterwards

Victoria

So I have a buddy who absolutely loves giving me head, and wants nothing in return! He is amazing at, I cum everytime ( which has never happened with head b4) and it’s the best feeling. But the last 2x he’s gone down I got BV shortly after. 😿 Doc said that humans have a lot of bacteria in their mouth, and it could affect a sensitive vagina! What should I do? I don’t want to give him up 😣