Should he be this angry?

Alright so this i what happened I didn't want to go to my last period of the day "Art History" and I told my boyfriend "can we do something else. This was the first time I skipped and since I'm a senior ad that class isn't that necessary for me to graduate, I thought I'd be ok to skip once. Since my older 21 year old brother constantly skipped during his senior year I thought it'd be cool to text him that I was...I was wrong Jo#$ texted mr "WTF get back to class" I told him I was with my boyfriend, and then he got really pissed saying "I'm happy to know you care more about your Dou#$ boyfriend then your grades!" then my boyfriend caught my phone and said "she can't she's mine, Mwahaha!" my brother then got furious and called him a bunch of explicit names, and then when we got to the movie theater, I got a call from my dad, I immediately ran into the bathroom (of the theater and faked like it was the school bathroom). My brother made constant threats and stated "be glade I'm not there because if I was I'd fu**ing find you and kill that son of a b**** your with." My boyfriend is a really good guy the only reason we couldn't return to school is cuse we road there with his friend who didn't want to leave the movie early...do you think my brother had I right to be mad or do you he's just too overprotective.