she changed..

lately i suddenly think back of her, my ex, dunno how was she now...?? and so i msg her.. at start it was a pretty nice conversation.. later on dunno y suddenly she i dunno how should i say change.. is she still keep on avoiding me.. i dunno... herrmmm miss the old her... dunno y she become like that is it because of me... feel like asking her.. should or shouldnt i call her.. i am still wondering.....