I'm upset that I wasn't a part of my brother's wedding?
Why do you feel this way?
Being left out makes me feel uncomfortable and disappointed.
I don't know how your relationship with your brother is. So that being the case, I can't really take a side. It sounds like the two of you need to have a conversation about your relationship.
I think you're right, as I can't lose him forever.
Sibling relationships can be volatile just like any other type of relationship. I'm glad you're going to talk to him as he's important to you and I'm sure you both can work this out and move forward in a more positive way.