<human>: Can you condense the text into three sentences or less?

[22M]Me and my [19F] girlfriend have been going out for almost a year now, and we've had our ups and downs and rough spots. She's lied to me multiple times in the past and has left me with a little bit of a trust issue. Recently she's been given the offer by a high school friend of her's to go interstate for her friend's university's orientation, which I've had described to me as essentially a party week. When she first brought it up I expressed interest in going, about a week later I said that I'd come to a conclusion that I'd love to go with her. She said that she'd ask her friend if that was OK, as she was putting her up for her stay.

Then a week later, yesterday, I asked her if I could come, if she had asked her friend if I could stay with her. She told me that it would be rude to ask her if I could come up. She said that it wasn't that she didn't want me to go, she said she didn't want to be rude. This hurt me, I didn't think it would be such a big deal, but it hurt me. Am I being irrational in thinking I should be able to go on a vacation with her? Is it OK to go on vacations without your SO, that they want to?

I feel like if I was to go on a vacation to one of her favourite cities and left her out she'd be deeply hurt, but she doesn't seem to realize that this hurts me.
<bot>: Girlfriend is going interstate for a university orientation "party" week and essentially does not want me to come with her, because she think's asking would be rude.