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should I keep this grudge?

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yesturday I was really mad with my little sister, because she did not want me to go to the store with her and my mom because it was supposed to be their day together. I wanted to go because there was a boy that I wanted to see at the store because we liked eachother. (I even got all freshed up to go) but I did not go because she didn't want me go. and if I went she would have been mad the whole time. she ruined everything just because I told her there was no point in her bringing her baby to the store, because the baby is going to be there when she gets back. I am really upset with her because she messed up everything for me and now today she acts as if she didn't do anything. I am so mad. should I keep this grudge against her to show her how mad I am or should I just let it go and act like she didn't just ruin everything.