Okay, I might sound crazy. Hear me out. My fiancé and I have been together for a year and a half. He mentioned this friend a couple times, but the friend lived out of state and they didn't keep in touch. The guy moved back to town, didn't tell my fiancé, until we ran into him one day. Now they talk occasionally, but to me that doesn't seem like a great friend. My problem is, my fiancé dated this dudes sister for 2 years and it is like that "one" ex that really messed you up. So he is still very hurt by her, and by proxy I get upset because I don't like the fact that she hurt him. I know the brother wasn't the one that did the "damage" and so I shouldn't hold that against him, but whenever we have been around him he is not very kind to me and always brings up his sister (talk about awkward). I don't mind him coming to the wedding, but it makes me uncomfortable to have him in the wedding party. I told my fiancé I would give it time and try to get to know this guy better, but it never seems to happen. My fiancé doesn't have a ton of friends, but I don't think just sticking a halfway friend in the party to "make it even" makes sense. I don't think I am unreasonable in this making me uncomfortable and I don't think I would have a problem with it if they had kept a better friendship or if the relationship between my fiancé and his ex had not ended so badly. What should I do?
(p.s. the ex's parents have consistently told my fiancé's family that they wish their daughter had ended up with him and they do not like her husband, ect..)