AITA for not wanting to go to my brother’s wedding after he invited my ex?

I (27F) have a complicated relationship with my brother (30M). We’ve always been close growing up, but things started to change when I went through a difficult breakup with my ex (28M). My ex and I had been together for five years, and the breakup was messy. It was a mutual decision, but it was still painful, and I needed time to heal.

The problem is, my brother and my ex have remained friends. I understand that they can still be friends, but I have made it clear to my brother that I’m not comfortable being around my ex, especially at family events. I still haven’t completely moved on from the relationship, and seeing him around just brings back a lot of pain.

Recently, my brother told me that he was getting married, and when I asked who he was inviting, he casually mentioned that my ex would be there. I immediately felt uneasy and told him I wasn’t comfortable with that. I explained that I don’t want to attend a wedding where my ex is present, and that I need some space to fully move on.

My brother got upset and said that I was being unreasonable and that I should be mature enough to handle seeing my ex at family events, especially at such an important one like his wedding. He said that he’s been friends with my ex for a long time, and it’s not fair for me to dictate who he invites.

I tried to explain that I wasn’t trying to control his guest list, but that I just didn’t feel emotionally ready for that. He called me selfish and said that I was making his wedding about me, which was never my intention.

Now, I’m feeling guilty. I love my brother and want to support him on his big day, but I just don’t know if I’m ready to face my ex, especially in such an intimate setting. I know it’s his wedding, but I also don’t want to put myself in a situation where I feel forced to pretend everything is fine when it’s not.

So, AITA for not wanting to go to my brother’s wedding because my ex will be there?