Was she rude?

So, I generally hang out with my friends on Friday nights because that is really the only day we are all available. This past Friday, however, I didn't hear a peep out of my friend after I had left her house that morning,(we did homework together) so I figured she just wanted to spend some time with her boyfriend, and I let them be. The day before, though, she was talking to me about how she was excited for a new movie coming out, and I said I couldn't wait to see it. She said, and I quote :"I think we're going to go on Tuesday, since that's the discount day." So, I naturally assumed that meant that I was invited to go with them, especially since this wasn't the first time we had all expressed interest in this particular film. Then, I received a message from her this afternoon, telling me to "Go see that movie! It's SOOO good." I asked her "I thought we were going to see it on Tuesday?" to which she said "My parents took me and my boyfriend to see it yesterday." Am I wrong for being hurt that she spend her Friday night at the movie that I presumed we were all going to see together next week? This also isn't the first time something like this has happened. It just hurts me because I have no one else to go with, and she knows that there is no way I would want to go see the movie alone, and that I'll probably not get a chance to see it anytime soon.