what do I do?

Alana
SORRY ITS LONG. Ok so in the beggining of the school year. A girl hooked up w this boy, he didn't want a relationship and she said ok but she really liked him. And I knew that because we talked about it in class. At that time I hadn't kissed anyone. Then like fast forward from August to December I had my first kiss. It happened to b w that boy and now we r dating. From the time I had my first kiss I wanted to tell her but I didnt know how to. She gets angry quickly and it wasn't as if we were bffs we only would talk in that class and smile at each other maybe in the hall. She found out through our mutual friend and was shocked. She's currently dating another guy btw. So like she comes up to me in class and is like we need to talk. I was told by our mutual friend that she was chill about it so I gave a little laugh. She was all "I don't know why your laughing this isn't funny at all. You were lying and deceitful and I had to find out through someone else. I don't want to hear ur side or anything. I thought we were friends and if he wants to date a liar then that's on him. I'm not hung up on him. I could care less. I'm pissed at u for being a liar. " then she walked away from me. So yeah I didn't tell her. But how the hell was I meant to bring it up. I didn't know how to and like I literally wanted to every day and I told like ppl that too. I tried to tell her that and she cut me off 3x. Like I don't wanna keep someone who is pissed like this in my life. But it still stings bc like I'm NEVER the person to do that and hurt others and I was in a situation I'd never been in before. Do u know if there's any way to fix this bond?she said how she "placed her self in my shoes and would tell the person. No matter how close they were." but ok she wouldn't bc she didn't when it was w a friend she'd hang w and hooked up w that guy that her friend liked.