<human>: So, a few months ago, my girlfriend of a year and a half told me that one of my favorite music artists coming to our hometown for a concert and agreed to go with me. We live in a pretty small town, so I was really excited because it was a big deal.

I realize soon afterwards that her father had a big event the same night, and I assumed she would feel like she needed to support her father instead of going to the concert with me. This was confirmed the day before the concert when she told me that she was going to her father's thing. So I ask my best male friend, he's busy. I ask my sister and mother, they don't want to go. I'm just out of luck. Oh well.

Skip to the day of the concert (this past Friday). She calls me saying that she's really excited because one of her friends invited my girlfriend to go with her and some other friends. Apparently, my girlfriend's father had told her that she would be dumb to not accept the backstage passes that the friend offered so she's going to the concert.

I got pretty pissed that I was not able to find any one to go with and she was going with friends after telling me that she couldn't go. It might be worthy of mention that after she had told me she was going, I convinced my sister to go with me (so I did actually get to go), but that doesn't change the fact that she was fine with me not going at all. Anyway, it turned into a huge fight about how I "don't understand the situation and refuse to try to  understand the situation." She is going off to college next year and says that she needs more time with her friends. I still think it was a shitty thing to do. Five days later, we're "taking a break" and things are super tense. 

Reddit, am I completely wrong in this? Everyone that I've explained this to is totally on my side, but I'm open to other opinions.

Can you provide a brief overview of the text?
<bot>: My girlfriend told me she can't go to concert with me and winds up going with other people. I got pissed.