Your cat will get over it. One of mine is holding a grudge against me right now. She's been holding it against me most of the summer, but I think she is relenting a little. I find people tuna and people salmon does wonders, especially the expensive kinds. In fact I am wondering if she is prolonging the grudge just so she can get the goodies. It started out when new neighbors moved in with a household of cats and two large dogs (I am responsible for that, you see), then she had to have surgery, then she had to stay at the kennel for a weekend, then a new cat joined my household and worse yet brought kittens with her (she's not going to have any more, I made sure of that!). So her nose has been quite a bit out of joint.
But one thing I have learned about cats, is that they eventually do forgive people they love. They can't keep up a grudge forever. Once they feel they have made their point, they forgive and forget.