To me, a successful relationship is all about compromise...give and take. If one is always giving and the other is always taking, the one giving is going to harbor resentment.
That said, I say you go with her on this trip with the understanding that she goes on a trip that you choose next. If she is not willing to do that, then perhaps you take your own vacation and think about whether or not this relationship is worth saving.
That said, I say you go with her on this trip with the understanding that she goes on a trip that you choose next. If she is not willing to do that, then perhaps you take your own vacation and think about whether or not this relationship is worth saving.