Originally you were placed in group B with Aris, which consisted of Harriet and Sonya and whatnot

Until one time you went in the maze and got lost & separated from your fellow gladers, and ended up in Group A with Thomas, Newt ect And you spent the rest of your time with them before escaping ect

Aris was in the WCKD facility eating his lunch by himself isolated with his hood up,until he sees a familiar face walk in with Newt, and that was you