Recurrent urine infections could be due to various reasons. Most common cause is stones in kidney which is blocking urine pathway. Other causes are changing sexual partners frequently, pregnancy, diabetes and of course childhood infections. The urine can also be due to retention of urine anywhere in its flow due to obstruction. The obstruction can be due to abnormality of structures since birth, stones or diseases like tumors. Females are more prone to urine infections. So you should get an ultrasound, CT scan done and also some urine and blood tests.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.