I need serious answers here?

theres this girl i new 4 about 3yrs now we off and on talk and liked eachother i finally decided to move on cuz she started ignoring me on her calls and on face book and without contacti can jus go over her house. i deleted every non source of info to contact her cept for facebook(but i deleted her from my friend list) 2weeks later she realizes i havent talked to her and(she got a bf now and he seems mean i'll beat his *** no prob though) i love this girl very very much and i always tell her that but she never says it back and seems to ignore me but yesturday i told her i was inlove with her she was speechless and we talked from there and i told her i want her by myside when she 18yo now she is 15 turning 16 im 17 turning 18 she is 1yr 7days bhide me. i have tryied to get over her and on facebook she deleted ne info contacting me(im guessing due to her bf) she told me she will always b side by side to me and she doesnt kno wat love means(now keep in mind i have been talking to her 4 3yrs now) but i find on her bf page she saying she love him. im guessing she telling wat he wanna hear. for that she telling me a guy that she liked alot and only said i love u once to me telling me she doesnt undestand love. i m confused as to wat is she trying to do i can tell she wants me in her life due to the fact she was mad i lost contact with her she also admitted and told me when she 18 she wants to b with me while im n marine corps and that she wrrys i'll get arrested while n marines cuz she under 18(due to a past event i pushed her away saying she to young we was almost a couple it jus never was the same again) nw it feels impossible to b with her i only got till april b4 i leave and i really love her what should i do leave? cuz it hurts me alot when i did that i cryed