I've been holding this grudge against my aunt for 3 years now.
Is there a reason for holding this much grudge?
Yes, she lied to me and I feel betrayed.
It can be hard to forgive people who have lied to you. You should talk to her and tell her why you are upset she might want to make amends.
I don't want to; I don't want her to feel any better about it.
Getting over a serious issue can be hard but she's family. You should be nice and try to work it out with her. You should at least try as a means of letting yourself grow past the problem.