Is AUTHOR wrong in the post ? POST : This all took place around finals season last year. We were both young little shits, and fought a lot. I had definitely felt less attraction towards her leading up to this, but she was infatuated with me. 
I had been pretty lenient with her leading up to this. She had admitted to having a crush on my best friend at one point, but I put up with it. The title basically says it all. It was the Monday of finals week, and I was heading overseas on Wednesday for around a month. She asked me for help with her studying, and we got into an argument over something stupid. I was fed up and straight up told her to “screw off and date someone else” and then proceeded to hang up. I was looking forward to leaving on my trip, and didn’t want her to make me feel all shitty before I left. We had been dating for nine months, and this was in high school. I’ve been kinda conflicted as of late, because I feel like a bit of a dick to screw her over before finals, but she was being a royal pain. AITA?  
TLDR: Dump gf of 9 months over something stupid before final