if you really care her,just speak out to let her know that you love her.
life is short,we can't imagine and control what will happen the next day,if you have the chance now,let her know you love her.
if you are deeply in love of her ,just let her know.even if she reject your apperciation,what you lost is just a sentence.
what you described let me recollect what happened to me and my girl, so we are in the same boat .if i were in your shoes i would said aloud to the girl :"you are my girl ,without you ,i never!"
hope that it is useful for you:)