highschool au. You and Sigma were very close friends. you guys had known each other for years by now and eventually, he fell inlove with you but you were dating someone else. You were completely fine with that and just told him that to not sabotage you and your lovers relationship. until one day he came running to you..

"y/n!! your boyfriend!! h-hes..cheating on you!!"

he was telling the truth, although you didnt believe him and you thought he was sabotaging you & your lovers relationship.