Feeling very bad

I am male 24, from last few days i am feeling very bad.I love a girl, but don know she loves me or not. It all started in coaching class, I proposed her for friendship but she rejected tere, ten i use to send her mails, ten she accept my frndship, frm last few months v use 2 chat daily for 4-5 on net. she is not gvng her mb. no. but she use 2 chat, i proposed her indirectly but she said she don belive in love. She is not ready to meet me, though she accepted my gift, but she didn talk with me tere, jst take the packet and left. Again she is ready to take my gift, tis time when i asked abt talking, ten she said she don know. Smtime she says she is engaged, but don gv any detail of her fiance like name or wen she is gng 2 mary or anyting.
She still chats with for hrs, once i said tat m gng 2 do sucide ten she become vry sentimental, once i didn cm for chat for few continous day ten she mailed me several time. But she didn gv me call(She is hvng my no.) i asked her many times 2 call me or else do voice chat, but she is not ready.
Does she loves me??? I cant live without her, I really loves her, I left my smoking for her bcoz she don like tis...I cant live without her, I will do sucide...Plz help me... :'(