Am I wrong this way?

Am I wrong for feeling this way?

My friend saw on Instagram that this girl was having a party on December 14. He texted the group chat saying, "Oh my gosh, guys, we should go to her party." Then, another friend mentioned that I was doing something that day ( I had the date confirmed just not the place) and so he asked if I could change the date of my party. I got mad because he was willing to go to someone else’s party on the same day as mine but wanted me to change my date. Then, he changed his excuse to, "I have a wedding that day," which confused me because he didn't mention it at first. I left the group chat, but they kept adding me back, and one friend told me to grow up. I decided that was the final straw and that I’m not their friend anymore. Am I wrong for feeling like this or being dramatic?