I framed a girl and watched her friendships fall apart
What a horrible thing to do. Why would you do that to her?
She tried to steal my boyfriend and is constantly badmouthing me. I got sick of it.
Given the circumstances being upset at her makes sense but that's a really extreme way to go about it. You shouldn't set her up for something she didn't do just to get back at her. Expose someone for what they are, not what they aren't because if people find out, you'll be the one even more hurt in the end.
I'll deal with the consequences after it's done. She doesn't have to know.
It's still very cruel to frame someone when they didn't do that act. You need to fix the situation and then deal with her like an adult.