I'm going to cut off contact with a girl who rejected me and led me on
Why do you think you were led on?
I just don't understand why someone would lead someone else on.  It's completely self-centered.
People should not lead people on and then reject them. So you have the right to cut off contact with this person who led you on.
Good.  I hate her.
From the way that you have described things, I'd say that you are better off just letting this person go.  She shouldn't have acted the way she did, so I would advise you to just forget about her.  Don't let yourself hate her, as it will just cause you more grief.