I'm going to report a coworker who reported me
Is there a reason you want to report them?
Yes, I've been planning this for months.
Unless you have a valid reason for reporting this coworker, this just appears childish. Let it go and move on from the frustration.
But it's so important to me.
Reporting a coworker for something they didn't do could potentially make you lose your job. Depending on the company you work for, there may be clauses in place to protect people from actions like this. There's no place for immature grudges in a workplace, just ignore the person.