I'm kinda in the same situation... I understand totally where you are coming from... but I think it is important to SHOW, rather than say, your feelings (saying your feelings makes it 100% true, showing keeps her guessing slightly).
try not talking to her for however long you feel is appropriate (not too long, it might suggest things aren't serious, when you want them to be), but then after do something really nice for her (or the other way around). push and pull
By doing this it shows her what you can do for her (by being the amazing loving boyfriend), and that you really care for her. But if you are distant AS WELL, you won't seem needy or lose value.
It's like teasing her. you are showing her your awesomeness, but only a tiny bit, making her want more.