You are attracted to this girl and you would like the friendship to become something more. Unfortunately, she is not romantically interested in you. That's probably not going to change.

What she has done is not very nice. She has been using you. You're her security blanket. She's known about you having feelings for her even before you told her. She likes having someone be real interested in her. A nice girl would have put some distance between herself and you to discourage you getting attached in a way that would lead to you getting hurt. Instead, she exploited your being attached to have someone give her bunches of emotional support, while really giving nothing much back.

Move on. She's wasting your time.