Is AUTHOR wrong in the post ? POST : Background: I'm a guy in 3rd year of college, met Annie since freshman year since our hometowns were very close to each other. She's had a boyfriend all 3 years and I never once hit on Annie. Over the past 2 years Annie complained to me and our other mutual guy friend in our group chat about some of her BF Jonathan's flaws. I shared one mutual class with Jonathan but we've definitely never been very close. 

A few weeks earlier, I had a dinner party for my 21st birthday, and invited most of my friends (over 10 people), including Annie. Originally Annie asked me if Jonathan could come too, and I said no, because if I make an exception for a +1 for her, then everyone would bring a +1 and I didn't want the dinner to be too big. So Annie said that she wouldn't be coming then, and then me and my other guy friend basically called her out for ditching something that was planned far in advance (I made a FB private event 3 weeks before the actual dinner). 2 hours before the actual dinner she said she was coming and I thought that was the end of that. She verbally said she would spot the Uber/Lyft to make up for the inconvenience (bill was about $15 dollars)

After that incident we didn't really talk too much, but a few days ago I saw Annie and Jonathan on the street for the first time in a while and I smiled and said hello. They made eye contact with me and as if they rehearsed it they split up and walked around me from both sides. I was PISSED. The day after that incident Annie messaged me and was like "Sorry I was studying for a test how are you??", but I ignored that and just said "We're still friends but it's probably better that we talk less since this semester is busy for both of us". We said some more small talk but she never referred to when she ignored me on the street or apologized for her behavior. 

Yesterday she asked me if I can pay her back for the Uber/Lyft, and I told her no since she said at the time that she would spot everyone. She said that she never said that and then some passive aggressive shit like "If you want to lose a friend over $15 then this is over". So I just ghosted her after that basically - am I in the asshole in this situation?