I dont understand my "bestfriend"?

weve been "bestfriends" for about 7years now i stopped talking to her because she ended up being someone shes not. i realize she lies to me alot & yet wen i ask her she still lies in my face. & . im always going to her house & meeting her up somewhere. so i decide to leave her some space for she can change & i found out basicially she replaced me with this one girl. now they always hanging outt. so iits been about a monthh noww & she says shes been trying to get a hold of me but yet theirs no missed calls or texts nothing, till yesturday she contacted my brother on fb telling him "SHE miiissess me & she doesnt understand why she doesnt talkk to me" [II dont havve a fb anymoree] && she knows exactlyy wheree ii livve watt doo ii doo? go bakk to beingg bestfriendss or lett herr goo???