your thoughts

My friend and I were talking about going on a holiday.. me, her and another friend. We were having trouble finding the right deal for 3 people but were continuing to look. I now find she booked a holiday, for herself and her boyfriend, only he doesn't want to go so she is going alone. So if she is going alone it seems she never wanted to go with me in the first place, cos I still could have gone had he not been able to make it and she told me. She said this holiday was a birthday present and her birthday was in July. So I am annoyed, and I have told her so.. because if she had said she had already booked this holiday, then myself and my other friend could have booked a holiday somewhere but she said nothing prior to now. Said yesterday and she is going next Friday.
I am just wondering why she did this. I'm hurt over it.