Just curious to ask you this "What did you think would happen?" You guys lost touch in college, you came at her talking about how you liked her, you did all the leg work and all the initiating, and after acknowledging that, you still came at her and confessed about how much you love her? Did you think that it was the magic words to get her to feel the same way when she wasn't showing any signs that she felt that way? I mean sure, maybe she was being nice and all that and still talked to you but there was no indication she cared about you. You heard through a friend this, or another friend that. As far as I can tell you didn't get a straight answer from her at all. When you overwhelmed her with your feelings, she decided to push you away by being mean. She handled it very immaturely and wasn't honest about how she felt and very inconsiderate of your feelings, but at the same time you convinced yourself you cared about her when you really had nothing more that infatuation. You tried to build some closeness with her, but it wasn't getting you anywhere. I don't think you are in love with her, no matter how special thinking about her made you feel.
It's hard to have a stable loving relationship if everything is one sided. And it was all on your side. It takes two to really establish that connection and I promise you you will find something much more special than what you had with this girl. Stop checking her facebook profile (it doesn't help you feel any better or stop thinking about her), hide her stories in your minifeed, and stop talking to her. If she tries to talk to you, maybe kindly tell her that you need some space. She should understand. If she doesn't, screw her. You have to focus on moving forward, which is made difficult with her in your life. So sever your ties, and focus on other things that are getting you someplace. You will look back and laugh at this one day, don't you worry.
I don't recommend contacting her again, unlike the person above me. No offense, but it will bring him back to square one. It's pissing her off, no more contact.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.