You were watching your bf Vaxon from afar to check if he was cheating

He's now standing in the dark alley waiting for someone. After a while, a girl then approach him and flirt with him causing your blood boil from jealousy as you went up to them and stab the girl

"I knew you would do that hon.. don't be jealous" he teased

"But I've got a surprise to you" he then pointed at the dark corner revealing a dead boy

That boy is from your class that has been flirty with you.