I a going to be Dr. Phil for a moment. Take a deep look at yourself. Why do you think this person is making excuses not to see you? Do you have any problems or your personality that, having met you, made this girl not want to see you. If so, you will need to make changes to rectify what ever the problem is.
I have learned that the most important thing is your kill your feelings, and only go out with a girl to have fun... only.. They don't deserve more than that.
I think if you really want to get it back, you might need to make her jealous. Some times thats all it takes =]
You know just move on. Go out with your mates. Atleast you learned something.....What? I cant help you in that department. Other than that girls can get a bit "off" sometimes. I know I am one. It is obvious she has issues that have nothing to do with you. Her own self esteem. Maybe it is a good thing that this has happen. Maybe you can turn her head once more in the future......
It's hard when you really like someone and for whatever reason they don't feel the same... or seem to to start with, then change. This can be for all kinds of reasons and often has nothing to do with you as a person. Maybe she just isn't ready for a relationship and has gotten frightened of the idea and backed off. Maybe she doesn't feel you and she are compatible, or perhaps she really does feel an attraction for another guy. If she continues to have excuses not to see you, then probably it's best to let things go for a while. Just be friendly, and there if she wants to chat, but don't push anything. Maybe things will once again become like they were. Maybe not. Try to believe that as long as you have given it a fair chance, that whatever happens is probably meant to be. I know that's hard to imagine now. But I know from experience. I had the terrible pain of desperately loving someone, being in a relationship with them, then they wanted to move on. I felt like it was the end of the world. Deep down I suppose I knew that we weren't really right for a lifetime together. But it hurt, I still wanted him and was so jealous thinking of him with anyone else. But then I met a man who was exactly what I needed, and I was what he was looking for too. We were in love in no time, and knew that it was right... that we were soul mates. We've never looked back. That was 13+ years ago, and we're now married with a 12 year old son. Our relationship has just grown better and stronger over time. So, I really do hope for you that you can find someone who is your soul mate, and that you will look back and realise that things worked out the way they did for a reason. Good luck.
don't get too hung up on an unrequited love, believe me its is really not fun. However, it is somethin that pretty much everyone has to go through as a life experience. Thinking you love someone but then they don't, and you try so hard to do everyting perfect but it still doesn't work. So then your depressed for days weeks or longer until you finally realize it wasn't worth it to get so messed up over. Even though it hurts. You'll learn a lot from heartbreak, it will only make you stronger. and you can move on to find a person who will actually feel the same way, and you'll know from experiene not to get too caught up until things get serious