Friend didn’t include me in her plans. Do I have the right to be mad?

We hang out every weekend, but this weekend she is going out of town with her other best friend. When I found out, I got mad and she asked did I want to go. I didn’t want to go, I just wanted to be invited. I got treated like an afterthought.

Do I have the right to be mad?
Friend didn’t include me in her plans. Do I have the right to be mad?
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