She got tested several times and was negative so there is no way she could have given him HIV.
Anyone who is sexually active should get tested. He probably had an experience outside their relationship not longer then 6 months prior to them getting tested. Did the woman get retested? Perhaps she is the one who brought HIV into the picture.
over 6 billion people on the earth. 3 to 4 billion are sexually active...That's a lot of fukcing tests ...
So then, I am guessing she is a friend of yours. Bet she was pretty worried for awhile.