How do I tell her I'm sorry for what I did?

I have a female friend that I formally had a crush on,and I told a lot of my friends (which I know was a BIG mistake,and I deeply regret it) . She got creeped out because of that, and because she didn't feel that way for me,and I kept bringing it up and not changing the subject. I feel like I've been so wrong, and I have a fear that she will hate me and never want to talk to me ever again (although she is a pretty chill person, and doesn't normally get upset with people). I don't know if she will forgive me, and I want to apologize to her so badly. I never meant to make her creeped out. And she also asked me to leave her alone,but I feel like apologizing is the right thing to do.