I'll give you one piece of advice here, for whatever it's worth - make it very clear that if she is going to "forgive" you and get back together with you, then she HAS to let it go 100%. Understand you're not in the position to make demands, but if she keeps it in the back of her head, then she's gonna use it against you every single time you fight and it'll be this little cloud hanging over both of you forever. That's no way to have a healthy relationship. So, if she can't move past it 100%, then it's probably not worth getting back together at all.