Is AUTHOR wrong in the post ? POST : All right, I was dating somebody for a decent chunk of time (3 years), we had a mutual breakup in August. Since then I’ve been trying to avoid him and some of his friends. However I just found out today that he was cheating on me with one of his friends for the last few months of our relationship. My ex and I used to run a club at our high school together but I’ve cold quit the club today, am refusing to speak with him or his new boyfriend. Am I the asshole for cutting off him and his friends? After I found out I did text my ex “Fuck you, I quit [the club]” 
I didn’t tell him why but I think he’ll know why. 
Am I the Asshole? 