I want to get an apartment for college with a friend and her friend but then back out later.
Why would you let them think you'll live with them and then leave them hanging?
She's a horrible person and I'm going to ditch her as soon as possible
That's so rude. They will need to find someone else. Just tell her the truth.
She will most certainly be upset, but I don't care. I have my reasons for not wanting to live with her.
It is really bad to sign a lese then break it. You know you are still on the hook for the place, they could get angry and trash your room. If you hate someone so much just avoid them, don't ruin your credit and their credit in the process.