Sometimes I just don't understand my boyfriends mom. She always has such good things to say about me…

Sometimes I just don't understand my boyfriends mom. She always has such good things to say about me to others behind my back. But then bitches to my best friend (who's dating my boyfriends brother and lives with them) that I'm always at the house. -.- asking if I'm trying to weasel my way back in. I am trying to move back in but only because of how horrible my home life is. ):