Everything has gone...?

i met a girl in fb..! we became very very close and i have fallen in love with her.. oneday i even proposed her..!! she told tht she likes me alot, she very well knw i can keep any girl happy thruout her life.. but she cant love me.. as she has no any such feeling towards me other than a gud friend...!!! thn she told .. "in future if i get some feeling i ll itself come and tell me.." even i had a confidence tht she will definitely love me...!!! again today suddenly we happend to talk abt this thing and she said tha she dont love me and she will never love me... askd me not have any hopes..!!! thn i asked her tell me whts wrong in me...?? but she dont have any reason..!! she replied, "i m getting pissed of on talking this, i cant means i cant... dnt make it irritating...!!" my heart is broken nw....!!! even nw.. i ll say she loves me... but dnt knw wy she says like this to me....??!?!? she is everything for me, she is my life...!! i can never imagine a life without her... i feel like like thousands of knives are poking in my heart at a same time... i need her in my life.... difinitely i m gonna die....!!! before me dying...!! i jus wanna ask u all one thing...!!! why she says tht she dnt love me...??? is there any hope for me to get her in my life...??? i wish to live for more than 100 years with her....!!! my love is pure..!!! i can never keep another girl in place of her...!!! tell me wht to do ..plsplsplsplsplsplsppls...!! :'-(