I'm going to ignore my ex when she will try talking to me on campus today.
Why are you ignoring an ex?
I'm tired of her trying to talk to me on campus every day
If she is annoying you that much, then it indeed may be wise to distance yourself from her. You should kindly explain to her why you don't enjoy being around her though.
You're right. I'm going to tell her tomorrow.
That's good. Let me know how that works out.