<human>: I asked my GF if she wanted to hang on Halloween and she told me she is going out with a girlfriend and she's "not sure what they will be doing". She said that "but maybe if it's not too late when im done we can hang later?" But I'm not going to sit around all night waiting for the phone to ring, especially if there's a chance it might not even happen. 

I'm a bit disappointed she didn't ask me first if I wanted to do something with her that night because we've both been hyping up Halloween for a couple months as its one of our favorite holidays. We are pretty serious but apparently not as serious as I thought since she didn't *want* to hang with me or include me in her plans.  Am I overreacting or being irrational to feel that she is being inconsiderate?

Give me a shortened version of the text
<bot>: GF of 3 months is hanging with a gf instead of me on Halloween and didn't ask to hang with me or include me. I'm disappointed.