I don't know if this belong here, but I just needed to vent, and any support would be welcome (even though it's flaired as "Venting" I would really appreciate advice).

I am currently doing a post-college gap-year program, and right before our Spring break, a few students in the program decided to run an "Assassins" game running from 14 March through 18 March. I didn't play, but my girlfriend did. One of the ways your assassin can 'kill' you is by putting red food coloring in your target's water bottle. Now, my girlfriend seemed really distressed by this notion, and really didn't want that to happen to her. After talking a day or two after she seemed really stressed about it, apparently she was just really tired and had other things stressing her a lot more, but that feeling associated with something as stupid as this game really stuck with me.

We had only been dating 4 months, but I felt anxious—is that the right word? maybe worried? distressed sounds more severe than it was for me—all day in classes about her. Besides, there was chaos right before and right after classes since you couldn't disrupt class to attack someone, and chaos just makes me stressed/anxious. I then asked my girlfriend why she decided to play if she didn't want this to happen, and she said that she didn't know that that would be one of the killing methods. So, then, I started to get silently angry at the organizers of the game since they didn't tell people what they were signing up for. Furthermore, she said that she wouldn't want to 'kill' her targets with food coloring (but rather 'kill' them by taping a picture of a lion to them) because she wouldn't want that done to her. In the end, she was killed by her target taping a lion to her back right as she was leaving the bathroom.

A week or so after the game was over, we reread the group messages introducing the game, and apparently the killing methods were in fact mentioned, but my girlfriend just missed that part.

Now, even though it's a month later, I still have moments where I feel the same almost drop in my stomach, and I am reminded and replay the scenes from that week. This isn't something that I should feel traumatized by; it was some fucking silly game for the community and my girlfriend simply missed a line of the instructions. But still, I don't want to have those feelings whenever I see the organizers (and I can't avoid them because they are in classes with me), or just randomly.

I am also not normally as empathetic as I seemed to be, so these are new emotions in a way, and I don't know how to cope with them. I've never felt the same even if the circumstances were more serious. I almost never cry (yay masculine gender roles training men not to /s), but I got closer than I have in a very long time, even though there were things that should have made me cry, but I just didn't.

Thanks for reading this wall of text. TIA for any help you can provide.