YOUR USEFUL CONTRIBUTIONS WILL BE OF HELP

HI. 

I HAVE AN ISSUE THAT HAVE BEEN BOTHERING MY MIND AND I JUST FEEL I SHOULD SHARE IT WITH U GUYS , PROBABLY I WILL GET ENCOURAGED BY SOME ONE THAT HAVE HAD SIMILAR EXPERIENCE.

I WAS IN A RELATIONSHIP WITH SOMEONE THAT WAS HIV POSITIVE AND SHE HIDE HER STATUS FROM ME KNOWING FULLY WELL THAT AM NEGATIVE. 

I HAD UNPROTECTED SEX WITH HER JUST ONCE (22ND MAY, 2015). AFTER WHICH WE BOTH WENT FOR TEST AND HER RESULT CAME OUT POSITIVE AND MINE NEGATIVE. EVER SINCE THEN I HAVE RAN SO MANY HIV TESTS AND MY RESULT STILL CAME OUT NEGATIVE. I TESTED NEGATIVE IN AUG 2015 WHICH IS 3 MONTHS AFTER MY RISK EXPOSURE. 

IN NOVEMBER 2015 I REPEATED THE TEST WHICH STILL CAME OUT NEGATIVE AND I DID THE LAST ONE IN DECEMBER 2015 AND IT WAS STILL NEGATIVE.

AM STILL WORRIED BECAUSE I DONT KNOW HOW POSSIBLE IT IS FOR A MAN THAT IS NEGATIVE TO HAVE UNPROTECTED SEX WITH A WOMAN THAT IS POSITIVE AND STILL REMAIN NEGATIVE AFTER 7 MONTHS. IS IT POSSIBLE PLS???

YOUR USEFUL CONTRIBUTIONS WILL BE OF HELP.