what identity...??

say... have you ever doubted a friend's identity...? i really need to know what people think but it...
lets say person X is a friend of mine... and... well... there's no easy way to say any of this... but im dying to get it outa my chest... it's really suffocating me... so yea...
*breaths*
ok...
X have been my close friend for quite some time... at 1st... everything was fine... then... when incident A happened... everything just went down hill... the following year... meaning this year... X had been keeping everything to herself a lot... never even wanna try to talk about it to me... still calls me her best friend... cancel every appointment (not that i blame her too much... that's HER incident B... not mine...)... i told her things that i want her to keep secret but she told anyway (eventhough so far i know its only one person... but its the person i spcifically said not to tell to... and this is MY incident C...)... she's always too busy for her best friend (aka... me...) but never too busy for her bf all the way in America... how sweet... and what's weird is... dont have the time or credit on fon to msg me bout anything BUT seem to have the time and credit on fon to msg me telling me NOT to tag picz of her onto her acc... i mean... WTF..???? what is wrong with her??
i know i know... i was talking bout identity at 1st then i crap bout this... sorry... im not going anywhere... but somethings are not to be told... (though i know i've told quite a few suposedly untold things... sorry) but anyway...
i have to admit... of all the things that X does... i have... a few times... this year... after incident A happened (but it's not related to incident A at all...)... sometimes things happened and i start doubting her identity... as in... her pictures... what she does before i knew her... and what she really does now... im not saying that i dont trust her... maybe i am a lil doubtful... but thats not it... >.< *sigh* (i know im confusing you... sorry... im confusing myself too actually...)
alright... long story short... i want my best friend back the way she was when i 1st knew her... i miss her... TT_TT she's my best friend AND my sister too... and i love my sister... i want her back... wherever she might be now... TT_TT