I had this problem too. I got real close to this friend and then feelings started to develop. I felt it and she felt it too but whenever she started to come on to me, I pushed her away told her a lie about how I don’t feel the same way.
Deep down though, I knew she would make me happy and I her happy. I understand why she could never forgive me for playing with her feelings.
It was something good which I threw away because of commitment issues.