Mikio Filitonga, 37, was on trial at the Auckland District Court for causing grievous bodily harm with reckless disregard and committing a criminal nuisance by doing an unlawful act.
The Crown said Filitonga, knowing himself to be positive after a test in May 2013 and "fully aware of his obligation to disclose his health status to his sexual partner", had unprotected sex with his live-in boyfriend from February 2014.
This caused his partner, who has name suppression, to contract HIV.