Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: m a 14yo girl and i live in the UK. I'm in year 10 at school (grade 9?) and im going to a school i just moved to at the start of the year.

When i first came to school for the first day around 6 months ago i met this girl - lets call her Jess - and she was my first "friend" at school. I say "friend" because like most friendships it stared out nice.
She used to compliment me alot but slowly she complimented me less - Now, I'm not an egomaniac that is obsessed with people constantly praising me, I wasn't bothered by her not complimenting me I just thought we might be drifting apart. I tried my best to reconnect with her and make an effort but she was cold and distant went i talked to her. I shrugged it off and just boiled it down to her just hanging around different people.
At the time this was all happening we had a mutual friend - Harriet - who i had gotten closer to over a few months. Harriet was Jess's best friend so she would tell her all her secrets - including mine. One day, Harriet told Jess that i had got off with Jess's friend's cousin - Jess's friend will be called Katie - and we made it very clear that she COULDN'T tell anyone ESPECIALLY not Katie. The first thing she does is tell Katie which is where this started.
Jess started to stay nasty things to me at random and pass it off as a joke. She'd say things like "you're just funny looking" "your teeth are really bad". I told her that my teeth were my biggest insecurity and she proceeded to pick on it. She did this thing where she would say she didn't like something about her self - say her teeth in this instance - and encourage people to say things like "well at least you dont have teeth like her" or picking on me for my ethnicity which im understandably quite sensitive about (I have some Japanese heritage). 
She would do this for weeks without any retaliation. She would say things like "you're clapped" "I can't even see your eyes".I confided in my other friends about it. Some of them even said they had had similar experiences with her.
This pushed me to my limit and yesterday it all came to ahead. Jess is insecure about her weight - I.Dont.Think.She.Is.Fat. - and she constantly talks about loosing weight and going to the gym etc. I approached her and said "I'm jealous of your eyebrows." she then retorted back at me "I'm not jealous of anything on you" OK then. 

"If i were you i'd be jealous of my weight."

She then grabbed my water out of my hand and drenched me then ran off and started telling everyone i called her fat and what a terrible person i am.
I needed to say something back or I think i would have lost my shit.

So... Am i the asshole?

fat shaming a girl who called me ugly