What happens when you are sexually active with a man for 6 months then all of a sudden he gives you bv 3 times.

So I’ve Been sexually active with this man since February and I never got bv from him until recently and he keeps saying he’s confused on why I keep getting it. I recently blocked him because I don’t need the negativity and bv in my life. I miss him. And I need serious answers on why I keep getting it?