If you were asked to be the maid of honor in your brothers wedding and get replaced 2 days before the wedding would you be upset?

I know this is off topic but I just need to vent...a year ago my brother got engaged and my soon to be sister in law asked me to be her maid of honor and of course I said yes...she had 2 other bridesmaids but they were never around to help her out. I had to do soo much work to help her out with the wedding. Obviously...I'm not complaining but the wedding is this Saturday. And the rehearsal dinner was yesterday. Best man says a speech and I'm there sitting waiting for my turn, after he was done he sst down & her other bridesmaid stands up..turns out I got replaced and they didn't even tell me. Not even afterwards. I obviously left mad after it was over. Then got a Text hours later from the bride to be. Saying "sorry I didn't tell you about the maid of honor thing"

I'm more upset that my own brother didn't let me know.

I don't even want to go to the wedding anymore. Idk if I should stay mad or just forgive and forget.