Chronic pyelonephritis history. Thnx.

I had uti e coli then prastate Infection 3 yrs back and cured at that time with 3 months of antibiotics, but it relapsed after 1 Yr and again I took 6 months of antibiotics and then stopped taking... I kept going for urine routine during these 6 months, urine routine was always normal, I last went for urine routine when I stopped The antibiotics and It was also normal... But I hadn't done urine culture after stopping Medicine... Now it has been 1.5 yrs stopping the antibiotics and I have no symptoms, but I see these days my urine is foamy... My BP is normal, Now I doubt if those bacteria are not fully dead and are slowly causing chronic pyelonephritis, although I have no symptoms at all but the foamy urine is devastating me 😞plz help, thnx...