My sister [24F] left to go have dinner with friends after she found my [21F] car was broken in to. Am I being irrational?

You're wildly overreacting.

  1. The fact that she was the last to drive it seems like a detail you added to make it seem like this was her fault. Pretty sure you can't lock a window from being broken. And it's not like she parked it on the street when you told her to park it somewhere else. This was random.

  2. What was she supposed to do? What would have been a rational response in your eyes? Shut down her entire night because your window got broken? Were you expecting her to cancel everything and stay with you to counsel you through it? Why would she need to make sure you were OK? Weren't you home with your parents? Couldn't they have done that? And wasn't she also at home when this happened?

I'm not understanding what your problem is, I guess. Something happened, it sucks, but you weren't mugged. You weren't assaulted. You weren't conned. Some rando broke into your car while you weren't in it. That happens, and it sucks, but it's not something that should require aftercare and a debrief. Her reaction was normal, yours is wildly overstated.

/r/relationships Thread