Open cervix and vulval itch. The cause?

I had started to have intercourse earlier this year around march and occasionally with my partner and after about 4 months i experienced itching in my vaginal area for which i was given course of tinidazole which relieved it by 95% and my partner was also treated by 2 FAS kits..we had intercourse again once and i again developed itching and this time on internal examnination by sepculum dr said tht i hv cervicitis for which again i was given doxycycline and tinidazole now i am much better but slight i would say 2% itching still remains in the vulval area..is the infection cured doctor ?..and also one more question i was on OC pills during initial few months of intercourse and after it i stopped using it and we used condoms always..n it was after we used condoms that i developed the infevtion..when i was examined for cervicitis doctor sd that my cervix doesnt look like that of a nulliparous and it is open..but u havent undergone any MtP or abortion procedure what could be the cause ?