Am i doing something wrong?

Ever since i left my last school there are these guys in this fraternity that are trying to get me to come back. The weird thing is that i never really talked to any of them . They all said i was rude and always make me seem stuck up. They are always staring at me but it was weird loll. Now that i no longer go my old college it seems like they have been trying hard to get me to come back. There is the one guy in their group who never really say anything to me. He is really quiet around me but i know he talks about me. He added me to facebook along with two others. The shy guy copies everything i say on facebook . It is really weird and he talks to my friends about me. They keep inviting me to paries but i hate them badly so i ignore there invites