Please Help me!!

Sooo... my ex-best friend (in 6th grade, i'm in 8th grade now), had/has a crush on this guy so much that she framed his ex for bullying her when she didn't. She told me she was being "bullied", so I told the teacher. Few days later after some investigation, they found out her plan, and she confessed that she planned the whole thing. Now, some people think I'm at fault for telling the teacher in the first place, and think I should apologize to her(even when I think I did nothing wrong). And my friend asked her if she liked me, and she said " Yeah!! of course! I've never had any problems with her." Yet, I still see her give me the "eye".I hate how she's being so fake towards everyone, and sometimes she would pretend to be "popular and gangster" to fit in with the crowd. And over the past year, I've been talking and bonding with the guy she had a crush on(not on purpose), and now I think I'm falling for him, but I'm scared that if I do, and she finds out, it's going to stir up more drama. What should I do?! Please help meee!!!