Why does my BV keep coming back? Does all cases of BV need to be treated or onlly if symptoms occur?

I was diagnosed with BV otherwise known as bacterial vagosis. I took medication for 7 days as prescribed and I'm back for my annual exam and turns out there was a detection of discharge and bacteria based on the pap smear. The doctor is going to send it out for tests and let me know what happens next. I only have one partner and the time and he only has me for his partner as well.