Is AUTHOR wrong in the post ? POST : Backstory: FH and GM (groomsman) we’re roommates before we met and are pretty much best friends. GM and his GF got together around the same time as me and FH. GF and I knew each other before these relationships and we just flat out don’t like each other. Our personalities just don’t mesh. Also, we all work at the same company but I work in a different department. When it comes to work she is a huge bitch. We’ve never done double dates or hung out as couples. Another important note is that GM is constantly going back and forth with wanting to be with her. One minute things are good the next he is telling FH he is going to break up with her. 
Fast forward to wedding planning. I tell FH that I don’t want her there. I don’t want someone I don’t like at my wedding. I also don’t want someone that doesn’t like me at my wedding. And on top of it I don’t want to pay $55 for someone like that to attend. Obviously she’s not that special to him if he is always wanting to end the relationship. FH says not a problem and tells GM when he gives him the Save the Date. FH told me things went good. Fast forward a month or two and GM and FH have a shift together. Turns out GM thought FH was kidding and said “well I live with her and she saw the save the date so how am I supposed to go without her?” I told FH that GM needs to figure it out because I flat out don’t want her there. 
AITA?

