You and Finn were best friends since you were little, both of you treat each others like siblings. Until one day when Finn saw you from a distance with your classmate Marcus looking so happy together, Finn felt a different feeling.. it's like a feeling of jealousy

"Why is y/n with Marcus? I mean, they are not that close as far as I know." - He thought to himself

Did Finn just felt jealousy whenever your talking to another guy? Who knows.. right?