She is amazing. how is this gonna work?

i love this girl. i have known her for almost a year. im a freshman and she's in 8th grade. don't tell me i don't love her its just a crush all that stuff. i know how i feel. we talk on messenger for hours each day. we really started talking a few months ago then she just kind of forgot about me. then she sent me a message on facebook and the spark was back. she likes me(im good friends with her brother in grade 10) but she is still dating this guy who she has been with for 2 years:(she says im cute and her brother tells me i am all she ever talks about. how can i get together with her? just pretend her boyfriend is out of the picture. do not tell me to find someone else or tell me not to break them up. i have been waiting patiently for 10 months and that is a while. just advice on how to win her over. we talk on the phone until two in the morning and whenever i listen to a song that reminds me of her, it kills me. i know she isn't mine and it hurts inside