HIV is unable to reproduce outside its living host (unlike many bacteria or fungi, which may do so under suitable conditions), except under laboratory conditions; therefore, it does not spread or maintain infectiousness outside its host.
HIV is transmitted by;
Unprotected penetrative anal and/or vaginal sex
Sharing works with other IV drug abusers
Mother to child
But once he had bleeding gums and unfortunately I have piles. Does this fact change the situation with rimming?
No. Rimming isn't an HIV risk, oral sex is not a risk and you had protected anal sex is not a risk.