<human>: both 21, dating just under a year.

An Imax just came to our city, and I asked her if we could go together for the first time. She said yes, and I was pumped.
 
Last weekend we saw a movie together, not at Imax, tonight she went to see the same movie with one of her girlfriends, (doesn't matter she is seeing the same movie), but what upsets me, is that it is at the Imax. I tried calling her before she left, but did not get a hold of her. 

Then I figured it be best not to guilt her before she goes, and bring it up after. Am I right to be upset?

Give me a shortened version of the text
<bot>: Made plans to go to imax together some time, she said yes, but went with another friend. Kinda upset.