That is your personal opinion, and I respect that.
Surely the fact that your aunt has been with her partner for so many decades tells you that her relationship is something special? I mean, how many straight couples stay married for 40 years? Very few.
This woman must be very special to your aunt if they have been together for so many years. I'd be happy that someone out there is making a member of my family happy, whether that person was a man or a woman.
He was a pervert, and gay men who pray on others like this are sickening, and deserve to be jailed for life.