Hello There was mouth sores in the mouth and you kidded and girl was an HIV infected. Now read this very carefully : Although HIV can be isolated typically in the low titers from saliva of a small proportion of infected individuals, there is no convincing evidence that saliva can transmit HIV infection, either through deep kissing or through other exposures , such occupationally to sex workers. In the mouth saliva contains ENDOGENOUS ANTIVIRAL FACTORS; among these many immunoglobulins are detected in the saliva and they kill virus ( of HIV individuals). Perhaps the best-studies of these, secretory leukocyte protease inhibitors ( SLPI)blocks HIV INFECTION in several cell culture systems and it is found in saliva. Now about sores in the mouth of infected girl , so sores are due to lowering of immunity , so minimal chance of getting HIV infection by you. But if these sores ( chance NIL ) exception , were full of virus then THERE IS NO CHANCE OF getting infection by you because your saliva was able to kill all virus ( through your mouth while kissing). Hope you will understand this thing and in my opinion you didn t get HIV infection.