Should I be mad at my ex?

I've been planning on taking my son to Disneyworld for about two years.
The ex decides she wants to take him last year, and was planning space camp for 2021. I told her we were planning on going for a while so she pushed up space camp in florida and not do Disneyworld.

Now suddenly she's doing both.
I'm very annoyed by that especially since they'll be able to do way more than I can.
In your opinions, is it all right for me to be pissed, or should I just brush it off.
9 mo
I was only briefly pissed. I got over it and moved in before this post. I was just curious as to other people's reactions since that's what this app is for.
9 mo
*moved on
Should I be mad at my ex?
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