I'm thinking of going to back to Oktoberfest,and Munich this year. I love Munich and Bavaria,and mentioned it in passing to a friend some time ago that I'd like to go back again one year.
Now said friend has decided that she wants to go too. A few ?ears ago I went to Oktoberfest and Munich with her. It did not go well. She spent the entire holiday sulking and playing with her phone if I dared to talk to anyone else. I didn't ignore her,and tried to include her in he conversation,but she still just sat there sulking. It was so bad that almost everyone asked me what was wrong with her.
A big part of the fun for me is meeting new people,particuarly people from different countries and I really don't want her to sit there sulking for the entire holiday again.
Also trying to get her to pay for anything was a nightmare. When I suggested splitting meals,after I'd paid for several she said Why? Do you have no money left?" 
I feel guilty because she's the friend I've known for the longest time.And I'm her only friend,but I cannot bear the thought of going on holiday with her again.
So AIBU to want to go without her? And if not is there a polite way of saying I want to go,but not with you?