<human>: Provide a brief overview of the text.

Essentially, I dated a girl in high school for three years, but we broke up before I went to college out of state. I met a new girl my second semester in college, and we've been together for 10 months now. 

Now, normally my past relationship isn't an issue, but when I come home for breaks, I spend a fair bit of time catching up with my friends from high school. The issue is, my ex and I are part of the same friend group, so it is often the case that she is present when we congregate.

My current girlfriend has freaked out (to the point of throwing up, refusing to talk to me for days, etc.) in the past when this has happened. She is adamant that under no circumstances am I allowed to be in the same place at the same time as my ex. She has gone so far as to say that it is "morally wrong" for couples to be friends post-breakup.

So, yesterday morning, I was invited to go to dinner with a group of 10+ people, including my ex, and I decided I wanted to go. I asked my girlfriend, and as soon as I did, she immediately stopped responding to texts, wouldn't answer my calls, etc. Upset that she would cut me off for even asking her about seeing my ex, I went to dinner anyway.

So, I guess what I really want to know is whether you all think I'm an asshole for doing so. I don't have an issue with her hanging out with her ex's, so I can't understand why she would have an issue with me doing the same, but maybe I'm missing something?

Any help would be appreciated. Thanks in advance!
<bot>: Dated girl for 3 years, broke up, new girlfriend of 10 months says I can't hang out with friends if ex is present.