Rebekah
There are a lot of things you may be over this situation, but personally? I can't say irrational or immature is one of them. How else are you supposed to react? Your brother's murderer shows up and you're just supposed to be happy about it?
I don't think you're being melodramatic either. I think everyone else is being ridiculous by jumping down your throat for having a reaction. Reactions, I'm pretty positive almost everyone here has had for some reason or another.