Is she really my friend?

i have a friend jess and she is best friends with this girl morgan...whenever im with her, shes always like, wheres morgan? i need to tell morgan somtihng! and she always ignores me when morgan is around...its not like i hate morgan, were sorta friends. But shes always like, morgan sit next to me and she doesnt include me much...i also feel like shes not my friend....but when shes with me its allll good..idk..