NC for this as quite outing. DH and one of my friends have never gotten on for reasons I won’t go into here as it’s too long and complicated to explain. IMO, they were both in the wrong.
Our wedding was last month and in the planning stages we had gone back and forth on whether to invite this particular DF. I was one of her bridesmaids so it felt very nasty to not invite her or just invite her to the evening for example but I wanted DH to feel comfortable on the day. DH insisted that we invite DF to a) not make matters worse between them and b) as they are one of my closest friends they should be there and c) he felt sure that everyone could be civil as they had been at another recent event.
Unfortunately on the day, DF did not behave as I would have expected. They appeared in a bad mood, implied I wasn’t spending enough time with them and other members of her particular friend group (it was my wedding day! I was a little busy!) and worst of all they didn’t acknowledge DH even when he was stood right next to me and DF blanked DH. I did not see the blanking incident but I acknowledge DF was acting rudely the rest of the day.
Since the wedding, DH gets upset/uncomfortable whenever I go to see this DF as he feels I shouldn’t be interacting with someone who was so nasty to him and he views this as a betrayal. However, I have been friends with DF for many many years and it would feel wrong to end the friendship. Also, DF is linked to other friends and family so it would make it very difficult for me to partake in particular hobbies and would make things awkward with around 10 other friends and family. They also live very locally so it would be hard to avoid them.
YABU: I should be loyal to DH and cut ties with DF.
YANBU: DH needs to accept the friendship with DF is separate to the relationship with DH.