SUBREDDIT: r/relationships
TITLE: Feeling bitter and obsessive [25f] because of a friends [26f] arrogant attitude. Why can't I just forget it?
POST: We've been friends for a good 8 years or so - I'd say fairly close in the past but not best friends. Roughly 4 years ago she moved to the city and ever since has acted very arrogant and it's really changed my opinion of her. I could go on for ages about her attitude towards me and my friends back home, but there's no point.

After trying to make our friendship work but feeling like I was being kicked in the teeth most the time, I decided about 12 months ago to distance myself. When she visited I would stop making an effort, as did she - I didn't want to be associated with her. I'm glad I did, but weirdly I feel like an almost obsessed with disliking her. I get really rattled by the tiniest thing, which isn't like me.

Sound ridiculous, I know! But whenever I hear of her I always think the worst (because of things she's said and done in the past) and I don't seem to be able to shift the bitterness of this dead relationship. Why do I even care!? 

Will these feelings go away naturally? Is there something I need to deal with here? Am I just crazy?
TL;DR: 
friend moved to the city, became arrogant, I distanced myself but for some reason can't let go of my bitterness