Hi there.. I am sorry to hear you are feeling this way.. We all feel this way at one time or another, though. I feel the same way with many of my friends, my family, and most of all my ex.. I showed her how much I loved her and she didn't do it back for me...
Just keep in touch with her. Make sure you always show her you care, and love her. I am sure she loves you, the thought that she hasn't been saying she loves you may not have even crossed her mind. Just be patient.
I also would like to say for all of us, and perhaps to make you feel a little more loved, I love you. We all do.

Good luck, God Bless.