AITA for blowing up on my girlfriend because she didn’t tell me that her and my brother dated in the past?

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The original was posted on /r/amitheasshole by /u/NoDrawer1434 on 2023-07-27 16:16:36+00:00.

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My (24m) girlfriend “Gianna” (22f) and I have been together for nine months now. I met her through some mutual friends. She is one of the best people I know. She’s funny, kind, outgoing, and intelligent.

For the past few days, her and I been on a trip with my family. This includes: My parents, my sister and brother-in-law, my aunt and uncle, two of my cousins, and my younger brother, “Kai” (22m). We’re currently at a resort.

Throughout these past few days, I noticed Gianna acting a little strange, she almost seemed like she was… nervous? But I didn’t question it until today…

While her and I were eating lunch, I asked what was going on and why she had been acting so weirdly. She kept avoiding the question until she finally told me.

She revealed that about two years before she met me, she had “thing” with this guy. At first, I was confused as to why she was telling me that and I pointed out that I dated girls before her as well.

Then, she told me that the guy in question was Kai, my brother.

After she told me that, I went completely silent for a moment. Gianna kept begging me to say something.

Ironically while that was happening, Kai happened to walk past and that’s when I fucking lost it.

I got right in his face and asked him why the hell he didn’t tell me that he dated my girlfriend. He looked taken back and a little scared. Gianna tried to get in between us and calm me down. I wasn’t having it, I kept yelling at the both of them. My other family members obviously heard what was going on and they ran out. They didn’t understand what was going on at the time.

Gianna tried defending herself by saying that I dated people in the past too. I told her that it was different because Kai is my brother. I also told her that she should’ve told me the moment we started dating.

Kai kept repeatedly saying that what him and Gianna had was just a fling, nothing serious, and that what her and I have is real. My other family members got in the middle of it and the whole thing was just a mess.

Gianna tried talking to me after everything calmed down but I told her that I needed time and I stormed out of the resort.

This happened two hours ago and since then Gianna and my family have been blowing up my phone. I haven’t replied to any of them. All of my family are on Gianna’s side. I called a few of my friends and they agree with me.

I feel like I could be the asshole because of how I handled it. I probably shouldn’t have made such a big scene.

AITA?