You've 'known' Liam for a while now. Well not really know but you know he exists and he knows you exist.

he and his friend group always pick on your friends and your friend group. But for some reason they always leave you alone. You often catch Liam or some of the other boys from their friend group staring at you.

Liam was bothering your friends once again but once his friends tried something with you he kind of shifted their focus away from you.