Hey people... first time fell in love with a girl... saw her in feb, 2012... ok coming straight to the point I did what no one else could have done just to get her eye on me... the worst thing is that we haven't met each other nor even saw each other... its a pure Facebook love but I respect this... so the real problem on eid I told her I like her like crazy... at first she was shocked and didn't want to talk to me but slowly she did... now with just few days gone we are talking like 3-4 hours (on fb though)... she cares for me that I am sure about... but she has a boyfriend for the last 2 years... but now whenevr she chats with she alwayss shows her extra care and all... at one time she cries for what I did to myself and at others she said I can't do anything I am sorry... the truth is I can't leave her no not all... she knows this too...
So please some advice would be nice...
PS- I <3 detailed advice :)

Seek professional help, this is normally called stalking and is a unhealthy relationship.

You feel in "love" with a idea, not a real person.

No contact would be the way,but it sounds like you donot have proper self control or motivation with something like a restraning order or order of protection ** at least yet

I kind of agree with fr_chuck you don't know her its not real love she of thought it was cute until she realized you where serious meet a girl in the real world get a real connection and build with a real person and not an idea most people are on Facebook for entertainment purposes.