I have never heard of HIV infection being spontaneously cleared. In the ensuing 40 or so years from the 80s to now - it is very likely you are not and never have been infected. The Humans who have decades with HIV were diagnosed early and put in anti virals to help keep their immune system intact.
You’re welcome for the info. If I were you- I would put my conscience to rest. You didn’t kill your best friend. ♥️