Dear Liz, I am just spitballing here, but does it just come down to the fact that you are afraid to tell him that you don't want to go?
A thing I notice from your posts is that seperation from his presence seems to do you good. Less conflict---thanks to 10min./day talking. You talk about fun you are having and seem generally happy on the trip. You haven't mentioned once about missing him, etc... Hmmm......
Dandylion