Is she really lying to me?

Every night I put my girlfriend to sleep over the phone, but lately after I give my little "I love you baby, just text or call if you need me, *mwah*" speech, she'll text me back saying "I wasnt really sleep." She seems like a nice girls but you kow.. Humans lie, tonight it seemed like she just had her phone on mute, because I couldnt hear a thing.. And she keeps telling me that her best guy friend's girlfriend doesnt like her at all for some reason. And today in school I walked past him and noticed one of his friends pointed at me and he looked at me, maybe Im just paranoid. What do you guys think?