WRT your thread title, I don't see that there's anything there for you to fix.

You had a friend, you developed feelings for her, you told her about your feelings, she shot you down, and in the past few years hasn't bothered to reach out to you.

I think you're right, sounds like you put her on a pedestal, she's human too and without knowing someone intimately, which includes their faults, its easy to do so with the object of our desire.

Time for you to move forward and close this chapter as looking back in this manner can hinder you greatly. But that's just my opinion...