How can I begin to forget a girl i've liked for 9 months and I was on the brink of going out with, but didn't?

I've liked this girl ever since september, the first day of school. She had a bf then. So I backed off, I honestly didn't even know her. So over the months, they broke up and we got to be friends. At first I was extremely shy and then I lost that and we became good friends. And we went from a word a week to talking on msn everyday. And some of the things she did it seemed like she might like me. Basically I worshiped her for many months. But I put off asking her out because of my acne which was horrible. So about 2 weeks ago, I figured that my acne was almost under control and a good time to ask, especially that we were getting to be really good friends at the time. Well I asked her, she was upset or anything, but she said she was busy and we'll do it some other time. Everyhting was normal after that. I asked her again the next week, and she said that she goes to her cottage almost every week, and that she'll tell me when she has time. Again eveyrhting was normal the following week.