Fixing my friendship?

Recently a friendship of mine has come into severe danger of being fractured, perhaps it already has. The friend in question is a girl whom prior to the events that have unfolded I easily considered one of my best friends. Conversation was effortless and fun and there was seldom an awkward moment. However, after a period of time I began to realize I was attracted to her and as such I acted accordlingly. For a while it seemed everything was going fine. However, due to unforseen consequences a large expanse of time ped during which I was unable to see this friend. When we finally came into contact again, things had changed. I could barely talk to her and found myself comletely enamored. After a couple of awkward outings things began to rapidly decay as I sought a reason why things had unfolded as they did. As it stands here I can barely get this friend to talk to me and am unsure if she even enjoys doing so anymore or rather if she is annoyed by my persistence to try and return things to the way they were. How should I go about repenting for my actions?