How do you feel if your partner made plans to go out with friends’ and totally excluded you without discussing it with you first?

It seems a lot of relationships experience this sort of thing happening, and the one partner feels left
Out, jealous, and excluded , which they have every right to feel that way , because a relationship takes 2 people choosing each other not one , When a partner doesn’t include their partner , it can easily add fire into that relationship,
I’m not saying your partner has to hold your hand everywhere you go , but you should always discuss things with your partner before making final decisions with friends’ Most people don’t grasp this concept and they wonder why they end up single again. How do you feel if your partner did this to you?
How do you feel if your partner made plans to go out with friends’ and totally excluded you without discussing it with you first?
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